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12x+3(9+x)=57
We move all terms to the left:
12x+3(9+x)-(57)=0
We add all the numbers together, and all the variables
12x+3(x+9)-57=0
We multiply parentheses
12x+3x+27-57=0
We add all the numbers together, and all the variables
15x-30=0
We move all terms containing x to the left, all other terms to the right
15x=30
x=30/15
x=2
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