5r+7r-15r=-12

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Solution for 5r+7r-15r=-12 equation: 



5r+7r-15r=-12

We move all terms to the left:

5r+7r-15r-(-12)=0

We add all the numbers together, and all the variables

-3r+12=0

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

-3r=-12

r=-12/-3

r=+4

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