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12+5(3x)=18+3(3x)
We move all terms to the left:
12+5(3x)-(18+3(3x))=0
We add all the numbers together, and all the variables
53x-(33x+18)+12=0
We get rid of parentheses
53x-33x-18+12=0
We add all the numbers together, and all the variables
20x-6=0
We move all terms containing x to the left, all other terms to the right
20x=6
x=6/20
x=3/10
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