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216=128-x
We move all terms to the left:
216-(128-x)=0
We add all the numbers together, and all the variables
-(-1x+128)+216=0
We get rid of parentheses
1x-128+216=0
We add all the numbers together, and all the variables
x+88=0
We move all terms containing x to the left, all other terms to the right
x=-88
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