4r+13=-15

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Solution for 4r+13=-15 equation: 



4r+13=-15

We move all terms to the left:

4r+13-(-15)=0

We add all the numbers together, and all the variables

4r+28=0

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

4r=-28

r=-28/4

r=-7

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