(x-5)(x+2)-(3-x)(2-x)=x-12
(x-5)(x+2)-(3-x)(2-x)=x-12x² + 2x - 5x - 10 - 6 + 3x + 2x - x² = x - 12- 16 = x - 12 / + 12x = - 4
x²+2x-5x-10-(6-3x-2x+x²)=x-12
x²-3x-10-x²+5x-6=x-12
2x-16=x-12
x=4
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(x-5)(x+2)-(3-x)(2-x)=x-12
x² + 2x - 5x - 10 - 6 + 3x + 2x - x² = x - 12
- 16 = x - 12 / + 12
x = - 4
(x-5)(x+2)-(3-x)(2-x)=x-12
x²+2x-5x-10-(6-3x-2x+x²)=x-12
x²-3x-10-x²+5x-6=x-12
2x-16=x-12
x=4