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257=-u+46
We move all terms to the left:
257-(-u+46)=0
We add all the numbers together, and all the variables
-(-1u+46)+257=0
We get rid of parentheses
1u-46+257=0
We add all the numbers together, and all the variables
u+211=0
We move all terms containing u to the left, all other terms to the right
u=-211
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