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231=65-x
We move all terms to the left:
231-(65-x)=0
We add all the numbers together, and all the variables
-(-1x+65)+231=0
We get rid of parentheses
1x-65+231=0
We add all the numbers together, and all the variables
x+166=0
We move all terms containing x to the left, all other terms to the right
x=-166
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