-9=-8+r/21

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Solution for -9=-8+r/21 equation: 



-9=-8+r/21

We move all terms to the left:

-9-(-8+r/21)=0

We add all the numbers together, and all the variables

-(r/21-8)-9=0

We get rid of parentheses

-r/21+8-9=0

We multiply all the terms by the denominator


-r+8*21-9*21=0

We add all the numbers together, and all the variables

-1r-21=0

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

-r=21

r=21/-1

r=-21

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