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137=x+11+x
We move all terms to the left:
137-(x+11+x)=0
We add all the numbers together, and all the variables
-(2x+11)+137=0
We get rid of parentheses
-2x-11+137=0
We add all the numbers together, and all the variables
-2x+126=0
We move all terms containing x to the left, all other terms to the right
-2x=-126
x=-126/-2
x=+63
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