8r-5r=-12

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Solution for 8r-5r=-12 equation: 



8r-5r=-12

We move all terms to the left:

8r-5r-(-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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