-81=7+2(-7r+5)

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Solution for -81=7+2(-7r+5) equation: 



-81=7+2(-7r+5)

We move all terms to the left:

-81-(7+2(-7r+5))=0



We calculate terms in parentheses: -(7+2(-7r+5)), so:

7+2(-7r+5)

determiningTheFunctionDomain
2(-7r+5)+7

We multiply parentheses

-14r+10+7

We add all the numbers together, and all the variables

-14r+17

Back to the equation:

-(-14r+17)



We get rid of parentheses

14r-17-81=0

We add all the numbers together, and all the variables

14r-98=0

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

14r=98

r=98/14

r=7

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