7r-2r+3r-4=12

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Solution for 7r-2r+3r-4=12 equation: 



7r-2r+3r-4=12

We move all terms to the left:

7r-2r+3r-4-(12)=0

We add all the numbers together, and all the variables

8r-16=0

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

8r=16

r=16/8

r=2

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