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233=140-x
We move all terms to the left:
233-(140-x)=0
We add all the numbers together, and all the variables
-(-1x+140)+233=0
We get rid of parentheses
1x-140+233=0
We add all the numbers together, and all the variables
x+93=0
We move all terms containing x to the left, all other terms to the right
x=-93
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