-28=r-7-

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Solution for -28=r-7- equation: 



-28=r-7-

We move all terms to the left:

-28-(r-7-)=0

We add all the numbers together, and all the variables

-(+r)-28=0

We get rid of parentheses

-r-28=0

We add all the numbers together, and all the variables

-1r-28=0

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

-r=28

r=28/-1

r=-28

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