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(x+11)+(x)=137
We move all terms to the left:
(x+11)+(x)-(137)=0
We add all the numbers together, and all the variables
x+(x+11)-137=0
We get rid of parentheses
x+x+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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