4(r+20)=1/4(20r+400)

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Solution for 4(r+20)=1/4(20r+400) equation: 



4(r+20)=1/4(20r+400)

We move all terms to the left:

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



Domain of the equation: 4(20r+400))!=0

r∈R



We multiply parentheses

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

We multiply all the terms by the denominator


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

Wy multiply elements

16r^2(2+320r(2=0

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