-3r+21=-5(2r-7)

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Solution for -3r+21=-5(2r-7) equation: 



-3r+21=-5(2r-7)

We move all terms to the left:

-3r+21-(-5(2r-7))=0



We calculate terms in parentheses: -(-5(2r-7)), so:

-5(2r-7)

We multiply parentheses

-10r+35

Back to the equation:

-(-10r+35)



We get rid of parentheses

-3r+10r-35+21=0

We add all the numbers together, and all the variables

7r-14=0

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

7r=14

r=14/7

r=2

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