28=4.r

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Solution for 28=4.r equation: 



28=4.r

We move all terms to the left:

28-(4.r)=0

We add all the numbers together, and all the variables

-(+4.r)+28=0

We get rid of parentheses

-4.r+28=0

We add all the numbers together, and all the variables

-4r+28=0

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

-4r=-28

r=-28/-4

r=+7

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