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159=278-x
We move all terms to the left:
159-(278-x)=0
We add all the numbers together, and all the variables
-(-1x+278)+159=0
We get rid of parentheses
1x-278+159=0
We add all the numbers together, and all the variables
x-119=0
We move all terms containing x to the left, all other terms to the right
x=119
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