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261=117-x
We move all terms to the left:
261-(117-x)=0
We add all the numbers together, and all the variables
-(-1x+117)+261=0
We get rid of parentheses
1x-117+261=0
We add all the numbers together, and all the variables
x+144=0
We move all terms containing x to the left, all other terms to the right
x=-144
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