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x+11=-2x-10
We move all terms to the left:
x+11-(-2x-10)=0
We get rid of parentheses
x+2x+10+11=0
We add all the numbers together, and all the variables
3x+21=0
We move all terms containing x to the left, all other terms to the right
3x=-21
x=-21/3
x=-7
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