9r-12=-20+11r

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Solution for 9r-12=-20+11r equation: 



9r-12=-20+11r

We move all terms to the left:

9r-12-(-20+11r)=0

We add all the numbers together, and all the variables

9r-(11r-20)-12=0

We get rid of parentheses

9r-11r+20-12=0

We add all the numbers together, and all the variables

-2r+8=0

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

-2r=-8

r=-8/-2

r=+4

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