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12x+18=3x+153
We move all terms to the left:
12x+18-(3x+153)=0
We get rid of parentheses
12x-3x-153+18=0
We add all the numbers together, and all the variables
9x-135=0
We move all terms containing x to the left, all other terms to the right
9x=135
x=135/9
x=15
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