r+3r+4r-5r-3=12

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Solution for r+3r+4r-5r-3=12 equation: 



r+3r+4r-5r-3=12

We move all terms to the left:

r+3r+4r-5r-3-(12)=0

We add all the numbers together, and all the variables

3r-15=0

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

3r=15

r=15/3

r=5

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