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12+5x=18+3x=
We move all terms to the left:
12+5x-(18+3x)=0
We add all the numbers together, and all the variables
5x-(3x+18)+12=0
We get rid of parentheses
5x-3x-18+12=0
We add all the numbers together, and all the variables
2x-6=0
We move all terms containing x to the left, all other terms to the right
2x=6
x=6/2
x=3
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