r+20=4(r+2)

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Solution for r+20=4(r+2) equation: 



r+20=4(r+2)

We move all terms to the left:

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



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

4(r+2)

We multiply parentheses

4r+8

Back to the equation:

-(4r+8)



We get rid of parentheses

r-4r-8+20=0

We add all the numbers together, and all the variables

-3r+12=0

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

-3r=-12

r=-12/-3

r=+4

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