20-5x+4x-x^2-(12-4x+3x-x^2)=2-x
20-5x+4x-x^2-12+x+x^2=2-x
8-5x+4x+x=2-x
8+0=2-x
8=2-x
x=2-8
x=-6
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20-5x+4x-x^2-(12-4x+3x-x^2)=2-x
20-5x+4x-x^2-12+x+x^2=2-x
8-5x+4x+x=2-x
8+0=2-x
8=2-x
x=2-8
x=-6