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87-11x=15-9x=
We move all terms to the left:
87-11x-(15-9x)=0
We add all the numbers together, and all the variables
-11x-(-9x+15)+87=0
We get rid of parentheses
-11x+9x-15+87=0
We add all the numbers together, and all the variables
-2x+72=0
We move all terms containing x to the left, all other terms to the right
-2x=-72
x=-72/-2
x=+36
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