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

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

We get rid of parentheses

r-2r+87+21=0

We add all the numbers together, and all the variables

-1r+108=0

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

-r=-108

r=-108/-1

r=+108

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