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15x-18=7x+30
We move all terms to the left:
15x-18-(7x+30)=0
We get rid of parentheses
15x-7x-30-18=0
We add all the numbers together, and all the variables
8x-48=0
We move all terms containing x to the left, all other terms to the right
8x=48
x=48/8
x=6
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