7u-21=3(u+5)

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Solution for 7u-21=3(u+5) equation: 



7u-21=3(u+5)

We move all terms to the left:

7u-21-(3(u+5))=0



We calculate terms in parentheses: -(3(u+5)), so:

3(u+5)

We multiply parentheses

3u+15

Back to the equation:

-(3u+15)



We get rid of parentheses

7u-3u-15-21=0

We add all the numbers together, and all the variables

4u-36=0

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

4u=36

u=36/4

u=9

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