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x-(-2x-7)=10
We move all terms to the left:
x-(-2x-7)-(10)=0
We get rid of parentheses
x+2x+7-10=0
We add all the numbers together, and all the variables
3x-3=0
We move all terms containing x to the left, all other terms to the right
3x=3
x=3/3
x=1
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