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x^2 -4x+4+x^2+3x=3(x^2+x-12)-(x^2+x-2)+2
2x^2-x+4=3x^2+3x-36-x^2-x+2+2
2x^2-x+4=2x^2+2x-32
2x^2-2x^2-x-2x+4+32=0
-3x+36=0
3x=36
x=36/3
x=12