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3x+11=-3x-11
We move all terms to the left:
3x+11-(-3x-11)=0
We get rid of parentheses
3x+3x+11+11=0
We add all the numbers together, and all the variables
6x+22=0
We move all terms containing x to the left, all other terms to the right
6x=-22
x=-22/6
x=-3+2/3
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