-100=7r+8r-40

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Solution for -100=7r+8r-40 equation: 



-100=7r+8r-40

We move all terms to the left:

-100-(7r+8r-40)=0

We add all the numbers together, and all the variables

-(15r-40)-100=0

We get rid of parentheses

-15r+40-100=0

We add all the numbers together, and all the variables

-15r-60=0

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

-15r=60

r=60/-15

r=-4

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