diff --git a/src/Primal.tsx b/src/Primal.tsx
index 7e3583f..fe8cf56 100644
--- a/src/Primal.tsx
+++ b/src/Primal.tsx
@@ -262,8 +262,8 @@ const PrimalCanvas = ({
                 const b_i = b.at(i)
 
                 drawSemiplane(g, a1.toNumber(), a2.toNumber(), b_i.toNumber(), {
-                    lineColor: '#040',
-                    lineWidth: 3,
+                    lineColor: '#488',
+                    lineWidth: 6,
                 })
             })
 
@@ -295,7 +295,8 @@ const PrimalCanvas = ({
                         x1.toNumber() + xi1.toNumber() / xiLen,
                         x2.toNumber() + xi2.toNumber() / xiLen,
                         0.25,
-                        '#44d'
+                        // '#44d'
+                        '#44f'
                     )
                 }
 
diff --git a/src/lib-v2/ro/primal-simplex.ts b/src/lib-v2/ro/primal-simplex.ts
index fefac07..2f619c5 100644
--- a/src/lib-v2/ro/primal-simplex.ts
+++ b/src/lib-v2/ro/primal-simplex.ts
@@ -114,7 +114,7 @@ export function computePrimalSimplexSteps(input: ProblemInput): ProblemOutput {
                 type: 'formula',
                 content: [
                     String.raw`I(\bar{x})`,
-                    String.raw`\{ i \in \{1, \dots, m\} \mid A_i \bar{x}_i = b_i \}`,
+                    String.raw`\{ i \in \{1, \dots, ${A.rows}\} \mid A_i \bar{x}_i = b_i \}`,
                     indexSetToLatex(I_x),
                 ].join(' = '),
             })
@@ -171,14 +171,18 @@ export function computePrimalSimplexSteps(input: ProblemInput): ProblemOutput {
 
                 const A_N__xi = A_N.apply(xi)
 
+                comments.push({
+                    type: 'formula',
+                    content: `N = \\{1, \\dots, ${A.rows}\\} \\setminus B = ${indexSetToLatex(N)}`,
+                })
+
                 comments.push({
                     type: 'formula',
                     content: [
-                        [`N = \\{1, \\dots, m\\} \\setminus B = ${indexSetToLatex(N)}`],
-                        [`A_N \\xi`, `${matrixToLatex(A_N)} ${vectorToLatex(xi)}`, `${vectorToLatex(A_N__xi)}`].join(
-                            ' = '
-                        ),
-                    ].join(' \\qquad '),
+                        `A_N \\xi`,
+                        `${matrixToLatex(A_N)} ${vectorToLatex(xi)}`,
+                        `${vectorToLatex(A_N__xi)}`,
+                    ].join(' = '),
                 })
 
                 if (!A_N__xi.getData().every(x => x.leq(RationalField.zero))) {