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256=215-x
We move all terms to the left:
256-(215-x)=0
We add all the numbers together, and all the variables
-(-1x+215)+256=0
We get rid of parentheses
1x-215+256=0
We add all the numbers together, and all the variables
x+41=0
We move all terms containing x to the left, all other terms to the right
x=-41
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