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5x+18=3x+42
We move all terms to the left:
5x+18-(3x+42)=0
We get rid of parentheses
5x-3x-42+18=0
We add all the numbers together, and all the variables
2x-24=0
We move all terms containing x to the left, all other terms to the right
2x=24
x=24/2
x=12
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