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-(2+7)-3(-8)=x
We move all terms to the left:
-(2+7)-3(-8)-(x)=0
We add all the numbers together, and all the variables
-x-9-3(-8)=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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