3(u-3)=8u+21

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Solution for 3(u-3)=8u+21 equation: 



3(u-3)=8u+21

We move all terms to the left:

3(u-3)-(8u+21)=0

We multiply parentheses

3u-(8u+21)-9=0

We get rid of parentheses

3u-8u-21-9=0

We add all the numbers together, and all the variables

-5u-30=0

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

-5u=30

u=30/-5

u=-6

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