72=-3(6+4r)-5(5-7r)

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Solution for 72=-3(6+4r)-5(5-7r) equation: 



72=-3(6+4r)-5(5-7r)

We move all terms to the left:

72-(-3(6+4r)-5(5-7r))=0

We add all the numbers together, and all the variables

-(-3(4r+6)-5(-7r+5))+72=0



We calculate terms in parentheses: -(-3(4r+6)-5(-7r+5)), so:

-3(4r+6)-5(-7r+5)

We multiply parentheses

-12r+35r-18-25

We add all the numbers together, and all the variables

23r-43

Back to the equation:

-(23r-43)



We get rid of parentheses

-23r+43+72=0

We add all the numbers together, and all the variables

-23r+115=0

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

-23r=-115

r=-115/-23

r=+5

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