20=-4(2r-1)

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Solution for 20=-4(2r-1) equation: 



20=-4(2r-1)

We move all terms to the left:

20-(-4(2r-1))=0



We calculate terms in parentheses: -(-4(2r-1)), so:

-4(2r-1)

We multiply parentheses

-8r+4

Back to the equation:

-(-8r+4)



We get rid of parentheses

8r-4+20=0

We add all the numbers together, and all the variables

8r+16=0

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

8r=-16

r=-16/8

r=-2

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