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-121+13x=2x+55
We move all terms to the left:
-121+13x-(2x+55)=0
We get rid of parentheses
13x-2x-55-121=0
We add all the numbers together, and all the variables
11x-176=0
We move all terms containing x to the left, all other terms to the right
11x=176
x=176/11
x=16
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