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15=x-2x+7
We move all terms to the left:
15-(x-2x+7)=0
We add all the numbers together, and all the variables
-(-1x+7)+15=0
We get rid of parentheses
1x-7+15=0
We add all the numbers together, and all the variables
x+8=0
We move all terms containing x to the left, all other terms to the right
x=-8
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