15+3r=-6

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Solution for 15+3r=-6 equation: 



15+3r=-6

We move all terms to the left:

15+3r-(-6)=0

We add all the numbers together, and all the variables

3r+21=0

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

3r=-21

r=-21/3

r=-7

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