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

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



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

We move all terms to the left:

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



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

7(r-3)-3r

We add all the numbers together, and all the variables

-3r+7(r-3)

We multiply parentheses

-3r+7r-21

We add all the numbers together, and all the variables

4r-21

Back to the equation:

-(4r-21)



We get rid of parentheses

2r-4r+21-7=0

We add all the numbers together, and all the variables

-2r+14=0

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

-2r=-14

r=-14/-2

r=+7

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