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15=-x+257
We move all terms to the left:
15-(-x+257)=0
We add all the numbers together, and all the variables
-(-1x+257)+15=0
We get rid of parentheses
1x-257+15=0
We add all the numbers together, and all the variables
x-242=0
We move all terms containing x to the left, all other terms to the right
x=242
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