-3=-3(-7+r)

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Solution for -3=-3(-7+r) equation: 



-3=-3(-7+r)

We move all terms to the left:

-3-(-3(-7+r))=0

We add all the numbers together, and all the variables

-(-3(r-7))-3=0



We calculate terms in parentheses: -(-3(r-7)), so:

-3(r-7)

We multiply parentheses

-3r+21

Back to the equation:

-(-3r+21)



We get rid of parentheses

3r-21-3=0

We add all the numbers together, and all the variables

3r-24=0

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

3r=24

r=24/3

r=8

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