4(r+20)=5(2r+4)

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Solution for 4(r+20)=5(2r+4) equation: 



4(r+20)=5(2r+4)

We move all terms to the left:

4(r+20)-(5(2r+4))=0

We multiply parentheses

4r-(5(2r+4))+80=0



We calculate terms in parentheses: -(5(2r+4)), so:

5(2r+4)

We multiply parentheses

10r+20

Back to the equation:

-(10r+20)



We get rid of parentheses

4r-10r-20+80=0

We add all the numbers together, and all the variables

-6r+60=0

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

-6r=-60

r=-60/-6

r=+10

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