12r-8r+4r-5r-r=15

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Solution for 12r-8r+4r-5r-r=15 equation: 



12r-8r+4r-5r-r=15

We move all terms to the left:

12r-8r+4r-5r-r-(15)=0

We add all the numbers together, and all the variables

2r-15=0

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

2r=15

r=15/2

r=7+1/2

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