75=-5(3+6r)

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Solution for 75=-5(3+6r) equation: 



75=-5(3+6r)

We move all terms to the left:

75-(-5(3+6r))=0

We add all the numbers together, and all the variables

-(-5(6r+3))+75=0



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

-5(6r+3)

We multiply parentheses

-30r-15

Back to the equation:

-(-30r-15)



We get rid of parentheses

30r+15+75=0

We add all the numbers together, and all the variables

30r+90=0

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

30r=-90

r=-90/30

r=-3

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