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