12r-10r+8r+3r=30

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Solution for 12r-10r+8r+3r=30 equation: 



12r-10r+8r+3r=30

We move all terms to the left:

12r-10r+8r+3r-(30)=0

We add all the numbers together, and all the variables

13r-30=0

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

13r=30

r=30/13

r=2+4/13

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