7=9(3+4r)

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Solution for 7=9(3+4r) equation: 



7=9(3+4r)

We move all terms to the left:

7-(9(3+4r))=0

We add all the numbers together, and all the variables

-(9(4r+3))+7=0



We calculate terms in parentheses: -(9(4r+3)), so:

9(4r+3)

We multiply parentheses

36r+27

Back to the equation:

-(36r+27)



We get rid of parentheses

-36r-27+7=0

We add all the numbers together, and all the variables

-36r-20=0

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

-36r=20

r=20/-36

r=-5/9

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