23+100:50•11•29-659=-630

Assuming ":" means division and standard order of operations (PEMDAS/BODMAS):

Compute: 23 + (100 ÷ 50) × 11 × 29 − 659

• 100 ÷ 50 = 2
• 2 × 11 = 22
• 22 × 29 = 638
• 23 + 638 = 661
• 661 − 659 = 2

So the left-hand side equals 2, not -630. The equation is false.