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6x+12-x²-2x+x²-4x+3x-12=2x+5
3x=2x+5
x=5
b) (x-5)(x+2)-(3-x)(2-x)=x-12
x²+2x-5x-10-6+3x+2x-x²=x-12
2x-16=x-12
x=4
c) (2x-5)(x+1)-2=(1-x)(8-2x)+2x
2x²+2x-5x-5-2=8-2x-8x+2x²
-3x-7=-10x+8
7x=15
x=2 1/7
6x+12-x²-2x+x²-4x+3x-12=2x+5
3x=2x+5 /-2x
x=5
b)(x-5)(x+2)-(3-x)(2-x)=x-12
x²+2x-5x-10-(6-3x-2x+x²)=x-12
x²+2x-5x-10-6+3x+2x-x²=x-12
2x-16=x-12
x=4
c)(2x-5)(x+1)-2=(1-x)(8-2x)+2x
2x²+2x-5x-5-2=8-2x-8x+2x²+2x
-3x-7=-8x+8
5x=15
x=3