21-r=(-87)+2r

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Solution for 21-r=(-87)+2r equation: 



21-r=(-87)+2r

We move all terms to the left:

21-r-((-87)+2r)=0

We add all the numbers together, and all the variables

-1r-((-87)+2r)+21=0



We calculate terms in parentheses: -((-87)+2r), so:

(-87)+2r

determiningTheFunctionDomain
2r+(-87)

We add all the numbers together, and all the variables

2r-87

Back to the equation:

-(2r-87)



We get rid of parentheses

-1r-2r+87+21=0

We add all the numbers together, and all the variables

-3r+108=0

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

-3r=-108

r=-108/-3

r=+36

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