(1)x(x-2-1)=0
x(x-3)=0
x=0æx=3
(2)(x-3)(x-3+4x)=0
(x-3)(5x-3)=0
x=3æx=3/5
(3)(x-2)(x+1)=0
x-2=0æx+1=0
x=2æx=-1
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