r+3r=-36

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Solution for r+3r=-36 equation: 



r+3r=-36

We move all terms to the left:

r+3r-(-36)=0

We add all the numbers together, and all the variables

4r+36=0

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

4r=-36

r=-36/4

r=-9

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