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8x-16=9x+87
We move all terms to the left:
8x-16-(9x+87)=0
We get rid of parentheses
8x-9x-87-16=0
We add all the numbers together, and all the variables
-1x-103=0
We move all terms containing x to the left, all other terms to the right
-x=103
x=103/-1
x=-103
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