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x-2=0 => x=2 y x+2=0 =>x=-2
x^2-4+7x-14=0 =>(x-2)(x+2)+7(x-2)=0 =>(x-2)(x+2+7)=0 => (x-2)(x+9)=0
x-2=0 => x=2 y x+9=0 =>x=-9