23(4+5)4+37=403

Interpreting the expression in standard arithmetic: 23(4+5)4+37 means 23 × (4+5) × 4 + 37.

• (4+5) = 9
• 23 × 9 = 207
• 207 × 4 = 828
• 828 + 37 = 865

So the left-hand side equals 865, not 403.

If you intended something else (different operations, or a different target like 403), please clarify the expression and I can help adjust or verify.