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

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



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

We move all terms to the left:

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



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

-5u+3(u+5)

We multiply parentheses

-5u+3u+15

We add all the numbers together, and all the variables

-2u+15

Back to the equation:

-(-2u+15)



We get rid of parentheses

2u-15+21=0

We add all the numbers together, and all the variables

2u+6=0

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

2u=-6

u=-6/2

u=-3

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