18-2r-7r=-20-11r

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Solution for 18-2r-7r=-20-11r equation: 



18-2r-7r=-20-11r

We move all terms to the left:

18-2r-7r-(-20-11r)=0

We add all the numbers together, and all the variables

-2r-7r-(-11r-20)+18=0

We add all the numbers together, and all the variables

-9r-(-11r-20)+18=0

We get rid of parentheses

-9r+11r+20+18=0

We add all the numbers together, and all the variables

2r+38=0

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

2r=-38

r=-38/2

r=-19

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