(1-x)(2-x)=(x+3)(x-4)
2-x-2x+x^2=x^2-4x+3x-12
x^2+2-3x=x^2-x-12
2-3x=-x-12
2+12=-x+3x
14=2x
7=x
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2-x-2x+x^2=x^2-4x+3x-12
x^2+2-3x=x^2-x-12
2-3x=-x-12
2+12=-x+3x
14=2x
7=x