3-8r-9+11r=r+12

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Solution for 3-8r-9+11r=r+12 equation: 



3-8r-9+11r=r+12

We move all terms to the left:

3-8r-9+11r-(r+12)=0

We add all the numbers together, and all the variables

3r-(r+12)-6=0

We get rid of parentheses

3r-r-12-6=0

We add all the numbers together, and all the variables

2r-18=0

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

2r=18

r=18/2

r=9

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