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(3x-15)=30
We move all terms to the left:
(3x-15)-(30)=0
We get rid of parentheses
3x-15-30=0
We add all the numbers together, and all the variables
3x-45=0
We move all terms containing x to the left, all other terms to the right
3x=45
x=45/3
x=15
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