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11x-142=68+x
We move all terms to the left:
11x-142-(68+x)=0
We add all the numbers together, and all the variables
11x-(x+68)-142=0
We get rid of parentheses
11x-x-68-142=0
We add all the numbers together, and all the variables
10x-210=0
We move all terms containing x to the left, all other terms to the right
10x=210
x=210/10
x=21
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