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257=153-x
We move all terms to the left:
257-(153-x)=0
We add all the numbers together, and all the variables
-(-1x+153)+257=0
We get rid of parentheses
1x-153+257=0
We add all the numbers together, and all the variables
x+104=0
We move all terms containing x to the left, all other terms to the right
x=-104
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