-21=1+6r+8

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Solution for -21=1+6r+8 equation: 



-21=1+6r+8

We move all terms to the left:

-21-(1+6r+8)=0

We add all the numbers together, and all the variables

-(6r+9)-21=0

We get rid of parentheses

-6r-9-21=0

We add all the numbers together, and all the variables

-6r-30=0

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

-6r=30

r=30/-6

r=-5

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