-7(3+2r)=21

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



-7(3+2r)=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We multiply parentheses

-14r-21-21=0

We add all the numbers together, and all the variables

-14r-42=0

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

-14r=42

r=42/-14

r=-3

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