4r+12=-72

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Solution for 4r+12=-72 equation: 



4r+12=-72

We move all terms to the left:

4r+12-(-72)=0

We add all the numbers together, and all the variables

4r+84=0

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

4r=-84

r=-84/4

r=-21

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