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5x+18=3x+12
We move all terms to the left:
5x+18-(3x+12)=0
We get rid of parentheses
5x-3x-12+18=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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