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-121+6x=-5x+99
We move all terms to the left:
-121+6x-(-5x+99)=0
We get rid of parentheses
6x+5x-99-121=0
We add all the numbers together, and all the variables
11x-220=0
We move all terms containing x to the left, all other terms to the right
11x=220
x=220/11
x=20
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