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-(-x-11)=10
We move all terms to the left:
-(-x-11)-(10)=0
We add all the numbers together, and all the variables
-(-1x-11)-10=0
We get rid of parentheses
1x+11-10=0
We add all the numbers together, and all the variables
x+1=0
We move all terms containing x to the left, all other terms to the right
x=-1
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