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X2-x-42=0
X2-7x+6x-42=9
X(x-7)+6(x-7)=0
(X+6) (x-7) =0
X=-6 or x=7
X2-7x+6x-42=9
X(x-7)+6(x-7)=0
(X+6) (x-7) =0
X=-6 or x=7
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