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x²-3x-4=2(x+2)
x²-3x-4=4x+4
x²-3x-4x-4-4=0
x²-7x-8=0
x²-8x+x-8=0
x(x-8)+1(x-8)=0
(x+1)(x-8)=0
x=-1vx=8
(-1,8)