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x+(2x-57)=90
We move all terms to the left:
x+(2x-57)-(90)=0
We get rid of parentheses
x+2x-57-90=0
We add all the numbers together, and all the variables
3x-147=0
We move all terms containing x to the left, all other terms to the right
3x=147
x=147/3
x=49
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