231=-u+18

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Solution for 231=-u+18 equation: 



231=-u+18

We move all terms to the left:

231-(-u+18)=0

We add all the numbers together, and all the variables

-(-1u+18)+231=0

We get rid of parentheses

1u-18+231=0

We add all the numbers together, and all the variables

u+213=0

We move all terms containing u to the left, all other terms to the right

u=-213

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