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-3(3+x)+4x(x-6=-4
We move all terms to the left:
-3(3+x)+4x(x-6-(-4)=0
We add all the numbers together, and all the variables
-3(x+3)+4x(x-6-(-4)=0
We multiply parentheses
-3x+4x(x-6-(-4)-9=0
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