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-7-5x=5x-87
We move all terms to the left:
-7-5x-(5x-87)=0
We get rid of parentheses
-5x-5x+87-7=0
We add all the numbers together, and all the variables
-10x+80=0
We move all terms containing x to the left, all other terms to the right
-10x=-80
x=-80/-10
x=+8
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