-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



Domain of the equation: 7)r+9)!=0

r!=0/1

r!=0

r∈R



We add all the numbers together, and all the variables

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

We multiply all the terms by the denominator


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



We calculate terms in parentheses: -((+8-31*7)r+9), so:

(+8-31*7)r+9

We add all the numbers together, and all the variables

(-209)r+9

We multiply parentheses

-209r+9

Back to the equation:

-(-209r+9)



We get rid of parentheses

209r-9=0

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

209r=9

r=9/209

r=9/209

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