6u+18=9u+21

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Solution for 6u+18=9u+21 equation: 



6u+18=9u+21

We move all terms to the left:

6u+18-(9u+21)=0

We get rid of parentheses

6u-9u-21+18=0

We add all the numbers together, and all the variables

-3u-3=0

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

-3u=3

u=3/-3

u=-1

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