4(r+20)=1.5(20r+400)

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Solution for 4(r+20)=1.5(20r+400) equation: 



4(r+20)=1.5(20r+400)

We move all terms to the left:

4(r+20)-(1.5(20r+400))=0

We multiply parentheses

4r-(1.5(20r+400))+80=0



We calculate terms in parentheses: -(1.5(20r+400)), so:

1.5(20r+400)

We multiply parentheses

30r+600

Back to the equation:

-(30r+600)



We get rid of parentheses

4r-30r-600+80=0

We add all the numbers together, and all the variables

-26r-520=0

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

-26r=520

r=520/-26

r=-20

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