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3x-87=57-5x
We move all terms to the left:
3x-87-(57-5x)=0
We add all the numbers together, and all the variables
3x-(-5x+57)-87=0
We get rid of parentheses
3x+5x-57-87=0
We add all the numbers together, and all the variables
8x-144=0
We move all terms containing x to the left, all other terms to the right
8x=144
x=144/8
x=18
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