-4=-28+r/3

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Solution for -4=-28+r/3 equation: 



-4=-28+r/3

We move all terms to the left:

-4-(-28+r/3)=0

We add all the numbers together, and all the variables

-(r/3-28)-4=0

We get rid of parentheses

-r/3+28-4=0

We multiply all the terms by the denominator


-r+28*3-4*3=0

We add all the numbers together, and all the variables

-1r+72=0

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

-r=-72

r=-72/-1

r=+72

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