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5(x-57)+15=15
We move all terms to the left:
5(x-57)+15-(15)=0
We add all the numbers together, and all the variables
5(x-57)=0
We multiply parentheses
5x-285=0
We move all terms containing x to the left, all other terms to the right
5x=285
x=285/5
x=57
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