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5x-18=3x+18
We move all terms to the left:
5x-18-(3x+18)=0
We get rid of parentheses
5x-3x-18-18=0
We add all the numbers together, and all the variables
2x-36=0
We move all terms containing x to the left, all other terms to the right
2x=36
x=36/2
x=18
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