2r-11r-15=20-8r

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Solution for 2r-11r-15=20-8r equation: 



2r-11r-15=20-8r

We move all terms to the left:

2r-11r-15-(20-8r)=0

We add all the numbers together, and all the variables

2r-11r-(-8r+20)-15=0

We add all the numbers together, and all the variables

-9r-(-8r+20)-15=0

We get rid of parentheses

-9r+8r-20-15=0

We add all the numbers together, and all the variables

-1r-35=0

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

-r=35

r=35/-1

r=-35

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