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x1=9 x2=-2
c) (x+8)(x-3)=0
x1=-8 x2=3
d) (x+8)(x+7)=0
x1=-8 x2=-7
e) (4x-3)(2x-1)=0
4x-3=0 2x-1=0
4x=3 2x=1
x1=3/4 x2=1/2