-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-81*(-10))-87



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

r-81*(-10)

We add all the numbers together, and all the variables

r+810

Back to the equation:

+(r+810)



We get rid of parentheses

r+810-87

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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