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165=-x+256
We move all terms to the left:
165-(-x+256)=0
We add all the numbers together, and all the variables
-(-1x+256)+165=0
We get rid of parentheses
1x-256+165=0
We add all the numbers together, and all the variables
x-91=0
We move all terms containing x to the left, all other terms to the right
x=91
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