6r-(-9)=21

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Solution for 6r-(-9)=21 equation: 



6r-(-9)=21

We move all terms to the left:

6r-(-9)-(21)=0

determiningTheFunctionDomain
6r-21-(-9)=0

We add all the numbers together, and all the variables

6r-12=0

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

6r=12

r=12/6

r=2

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