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6x+18=3x-30
We move all terms to the left:
6x+18-(3x-30)=0
We get rid of parentheses
6x-3x+30+18=0
We add all the numbers together, and all the variables
3x+48=0
We move all terms containing x to the left, all other terms to the right
3x=-48
x=-48/3
x=-16
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