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81-8x=129-14x
We move all terms to the left:
81-8x-(129-14x)=0
We add all the numbers together, and all the variables
-8x-(-14x+129)+81=0
We get rid of parentheses
-8x+14x-129+81=0
We add all the numbers together, and all the variables
6x-48=0
We move all terms containing x to the left, all other terms to the right
6x=48
x=48/6
x=8
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