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2x-11=-5x-81
We move all terms to the left:
2x-11-(-5x-81)=0
We get rid of parentheses
2x+5x+81-11=0
We add all the numbers together, and all the variables
7x+70=0
We move all terms containing x to the left, all other terms to the right
7x=-70
x=-70/7
x=-10
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