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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We multiply parentheses

-7r-21r-35-21=0

We add all the numbers together, and all the variables

-28r-56=0

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

-28r=56

r=56/-28

r=-2

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