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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