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-4(3x+9)=-12x-36
We move all terms to the left:
-4(3x+9)-(-12x-36)=0
We multiply parentheses
-12x-(-12x-36)-36=0
We get rid of parentheses
-12x+12x+36-36=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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