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265=129-x
We move all terms to the left:
265-(129-x)=0
We add all the numbers together, and all the variables
-(-1x+129)+265=0
We get rid of parentheses
1x-129+265=0
We add all the numbers together, and all the variables
x+136=0
We move all terms containing x to the left, all other terms to the right
x=-136
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