99=42+3u

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Solution for 99=42+3u equation: 



99=42+3u

We move all terms to the left:

99-(42+3u)=0

We add all the numbers together, and all the variables

-(3u+42)+99=0

We get rid of parentheses

-3u-42+99=0

We add all the numbers together, and all the variables

-3u+57=0

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

-3u=-57

u=-57/-3

u=+19

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