-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



Domain of the equation: 5(20r+400))!=0

r∈R



We multiply parentheses

-4r-(1/5(20r+400))-80=0

We multiply all the terms by the denominator


-4r*5(20r+400))-(1-80*5(20r+400))=0

Wy multiply elements

-20r^2(2-400r(2=0

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