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X-3(X+4)=9
We move all terms to the left:
X-3(X+4)-(9)=0
We multiply parentheses
X-3X-12-9=0
We add all the numbers together, and all the variables
-2X-21=0
We move all terms containing X to the left, all other terms to the right
-2X=21
X=21/-2
X=-10+1/2
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