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-3(x+7)+24=6x-9)(x+9)
We move all terms to the left:
-3(x+7)+24-(6x-9)(x+9))=0
We multiply parentheses
-3x-(6x-9)(x+9))+24-21=0
We multiply parentheses ..
-(+6x^2+54x-9x-81))+24-21-3x=0
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