-5r+7-9r=21

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Solution for -5r+7-9r=21 equation: 



-5r+7-9r=21

We move all terms to the left:

-5r+7-9r-(21)=0

We add all the numbers together, and all the variables

-14r-14=0

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

-14r=14

r=14/-14

r=-1

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