158=42-u

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Solution for 158=42-u equation: 



158=42-u

We move all terms to the left:

158-(42-u)=0

We add all the numbers together, and all the variables

-(-1u+42)+158=0

We get rid of parentheses

1u-42+158=0

We add all the numbers together, and all the variables

u+116=0

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

u=-116

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