-21-r=68

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Solution for -21-r=68 equation: 



-21-r=68

We move all terms to the left:

-21-r-(68)=0

We add all the numbers together, and all the variables

-1r-89=0

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

-r=89

r=89/-1

r=-89

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