-21-3r=78

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Solution for -21-3r=78 equation: 



-21-3r=78

We move all terms to the left:

-21-3r-(78)=0

We add all the numbers together, and all the variables

-3r-99=0

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

-3r=99

r=99/-3

r=-33

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