-81=r/(-10)+(-87)

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Solution for -81=r/(-10)+(-87) equation: 



-81=r/(-10)+(-87)

We move all terms to the left:

-81-(r/(-10)+(-87))=0

We multiply all the terms by the denominator


-(r-81*(-10)+(-87))=0



We calculate terms in parentheses: -(r-81*(-10)+(-87)), so:

r-81*(-10)+(-87)

We add all the numbers together, and all the variables

r+723

Back to the equation:

-(r+723)



We get rid of parentheses

-r-723=0

We add all the numbers together, and all the variables

-1r-723=0

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

-r=723

r=723/-1

r=-723

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