40=r(12+10+7.5)

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Solution for 40=r(12+10+7.5) equation: 



40=r(12+10+7.5)

We move all terms to the left:

40-(r(12+10+7.5))=0

We add all the numbers together, and all the variables

-(r(29.5))+40=0



We calculate terms in parentheses: -(r(29.5)), so:

r(29.5)

We multiply parentheses

29.5r

Back to the equation:

-(29.5r)



We add all the numbers together, and all the variables

-(+29.5r)+40=0

We get rid of parentheses

-29.5r+40=0

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

-29.5r=-40

r=-40/-29.5

r=1+7/19.666666666667

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