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-87=-15-8x
We move all terms to the left:
-87-(-15-8x)=0
We add all the numbers together, and all the variables
-(-8x-15)-87=0
We get rid of parentheses
8x+15-87=0
We add all the numbers together, and all the variables
8x-72=0
We move all terms containing x to the left, all other terms to the right
8x=72
x=72/8
x=9
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