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166=86-x
We move all terms to the left:
166-(86-x)=0
We add all the numbers together, and all the variables
-(-1x+86)+166=0
We get rid of parentheses
1x-86+166=0
We add all the numbers together, and all the variables
x+80=0
We move all terms containing x to the left, all other terms to the right
x=-80
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