-3=3u+21-6u

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Solution for -3=3u+21-6u equation: 



-3=3u+21-6u

We move all terms to the left:

-3-(3u+21-6u)=0

We add all the numbers together, and all the variables

-(-3u+21)-3=0

We get rid of parentheses

3u-21-3=0

We add all the numbers together, and all the variables

3u-24=0

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

3u=24

u=24/3

u=8

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