3x^2+12x-x-4=2x^2+6x+3x+9-17
3x^2+11x-4=2x^2+9x-8
x^2-2x+4=0
(x-2)^2=0
x-2=0
x=2
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3x^2+12x-x-4=2x^2+6x+3x+9-17
3x^2+11x-4=2x^2+9x-8
x^2-2x+4=0
(x-2)^2=0
x-2=0
x=2