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7x-18=5x+30
We move all terms to the left:
7x-18-(5x+30)=0
We get rid of parentheses
7x-5x-30-18=0
We add all the numbers together, and all the variables
2x-48=0
We move all terms containing x to the left, all other terms to the right
2x=48
x=48/2
x=24
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