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3x-87=-x+25
We move all terms to the left:
3x-87-(-x+25)=0
We add all the numbers together, and all the variables
3x-(-1x+25)-87=0
We get rid of parentheses
3x+1x-25-87=0
We add all the numbers together, and all the variables
4x-112=0
We move all terms containing x to the left, all other terms to the right
4x=112
x=112/4
x=28
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