12r-7r-1=19

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Solution for 12r-7r-1=19 equation: 



12r-7r-1=19

We move all terms to the left:

12r-7r-1-(19)=0

We add all the numbers together, and all the variables

5r-20=0

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

5r=20

r=20/5

r=4

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