11r-20=20+9r

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



11r-20=20+9r

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

11r-9r-20-20=0

We add all the numbers together, and all the variables

2r-40=0

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

2r=40

r=40/2

r=20

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