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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



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

-2(2r+1)

We multiply parentheses

-4r-2

Back to the equation:

-(-4r-2)



We get rid of parentheses

2r+4r+2-20=0

We add all the numbers together, and all the variables

6r-18=0

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

6r=18

r=18/6

r=3

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