-21=-3(5-r)

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



-21=-3(5-r)

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(-3(-1r+5))-21=0



We calculate terms in parentheses: -(-3(-1r+5)), so:

-3(-1r+5)

We multiply parentheses

3r-15

Back to the equation:

-(3r-15)



We get rid of parentheses

-3r+15-21=0

We add all the numbers together, and all the variables

-3r-6=0

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

-3r=6

r=6/-3

r=-2

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