-4r-18-9r=21

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Solution for -4r-18-9r=21 equation: 



-4r-18-9r=21

We move all terms to the left:

-4r-18-9r-(21)=0

We add all the numbers together, and all the variables

-13r-39=0

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

-13r=39

r=39/-13

r=-3

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