15r+3r=-18

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Solution for 15r+3r=-18 equation: 



15r+3r=-18

We move all terms to the left:

15r+3r-(-18)=0

We add all the numbers together, and all the variables

18r+18=0

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

18r=-18

r=-18/18

r=-1

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