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