-1=7+8r

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Solution for -1=7+8r equation: 



-1=7+8r

We move all terms to the left:

-1-(7+8r)=0

We add all the numbers together, and all the variables

-(8r+7)-1=0

We get rid of parentheses

-8r-7-1=0

We add all the numbers together, and all the variables

-8r-8=0

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

-8r=8

r=8/-8

r=-1

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