3r-6=-21

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Solution for 3r-6=-21 equation: 



3r-6=-21

We move all terms to the left:

3r-6-(-21)=0

We add all the numbers together, and all the variables

3r+15=0

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

3r=-15

r=-15/3

r=-5

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