12+4r=28

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Solution for 12+4r=28 equation: 



12+4r=28

We move all terms to the left:

12+4r-(28)=0

We add all the numbers together, and all the variables

4r-16=0

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

4r=16

r=16/4

r=4

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