4r-2r-4=12

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Solution for 4r-2r-4=12 equation: 



4r-2r-4=12

We move all terms to the left:

4r-2r-4-(12)=0

We add all the numbers together, and all the variables

2r-16=0

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

2r=16

r=16/2

r=8

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