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9x-11=-2x-18
We move all terms to the left:
9x-11-(-2x-18)=0
We get rid of parentheses
9x+2x+18-11=0
We add all the numbers together, and all the variables
11x+7=0
We move all terms containing x to the left, all other terms to the right
11x=-7
x=-7/11
x=-7/11
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