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-15=x-3-8
We move all terms to the left:
-15-(x-3-8)=0
We add all the numbers together, and all the variables
-(x-11)-15=0
We get rid of parentheses
-x+11-15=0
We add all the numbers together, and all the variables
-1x-4=0
We move all terms containing x to the left, all other terms to the right
-x=4
x=4/-1
x=-4
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