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15-2x=-7x=
We move all terms to the left:
15-2x-(-7x)=0
We get rid of parentheses
-2x+7x+15=0
We add all the numbers together, and all the variables
5x+15=0
We move all terms containing x to the left, all other terms to the right
5x=-15
x=-15/5
x=-3
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