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15-8x=-7x
We move all terms to the left:
15-8x-(-7x)=0
We get rid of parentheses
-8x+7x+15=0
We add all the numbers together, and all the variables
-1x+15=0
We move all terms containing x to the left, all other terms to the right
-x=-15
x=-15/-1
x=+15
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