31=-8+7(r+9)

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Solution for 31=-8+7(r+9) equation: 



31=-8+7(r+9)

We move all terms to the left:

31-(-8+7(r+9))=0



We calculate terms in parentheses: -(-8+7(r+9)), so:

-8+7(r+9)

determiningTheFunctionDomain
7(r+9)-8

We multiply parentheses

7r+63-8

We add all the numbers together, and all the variables

7r+55

Back to the equation:

-(7r+55)



We get rid of parentheses

-7r-55+31=0

We add all the numbers together, and all the variables

-7r-24=0

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

-7r=24

r=24/-7

r=-3+3/7

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