20=-5(r+11)+20

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Solution for 20=-5(r+11)+20 equation: 



20=-5(r+11)+20

We move all terms to the left:

20-(-5(r+11)+20)=0



We calculate terms in parentheses: -(-5(r+11)+20), so:

-5(r+11)+20

We multiply parentheses

-5r-55+20

We add all the numbers together, and all the variables

-5r-35

Back to the equation:

-(-5r-35)



We get rid of parentheses

5r+35+20=0

We add all the numbers together, and all the variables

5r+55=0

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

5r=-55

r=-55/5

r=-11

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