21-r/28=-12

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Solution for 21-r/28=-12 equation: 



21-r/28=-12

We move all terms to the left:

21-r/28-(-12)=0

We add all the numbers together, and all the variables

-r/28+33=0

We multiply all the terms by the denominator


-r+33*28=0

We add all the numbers together, and all the variables

-1r+924=0

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

-r=-924

r=-924/-1

r=+924

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