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15=2x-99
We move all terms to the left:
15-(2x-99)=0
We get rid of parentheses
-2x+99+15=0
We add all the numbers together, and all the variables
-2x+114=0
We move all terms containing x to the left, all other terms to the right
-2x=-114
x=-114/-2
x=+57
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