85=-8+3(-3r+7)

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Solution for 85=-8+3(-3r+7) equation: 



85=-8+3(-3r+7)

We move all terms to the left:

85-(-8+3(-3r+7))=0



We calculate terms in parentheses: -(-8+3(-3r+7)), so:

-8+3(-3r+7)

determiningTheFunctionDomain
3(-3r+7)-8

We multiply parentheses

-9r+21-8

We add all the numbers together, and all the variables

-9r+13

Back to the equation:

-(-9r+13)



We get rid of parentheses

9r-13+85=0

We add all the numbers together, and all the variables

9r+72=0

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

9r=-72

r=-72/9

r=-8

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