20=2(-1+r)

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Solution for 20=2(-1+r) equation: 



20=2(-1+r)

We move all terms to the left:

20-(2(-1+r))=0

We add all the numbers together, and all the variables

-(2(r-1))+20=0



We calculate terms in parentheses: -(2(r-1)), so:

2(r-1)

We multiply parentheses

2r-2

Back to the equation:

-(2r-2)



We get rid of parentheses

-2r+2+20=0

We add all the numbers together, and all the variables

-2r+22=0

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

-2r=-22

r=-22/-2

r=+11

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