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

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



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

We move all terms to the left:

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



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

3(u-5)-5u

We add all the numbers together, and all the variables

-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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