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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
8x-60=0
We move all terms containing x to the left, all other terms to the right
8x=60
x=60/8
x=7+1/2
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