r+1=-3r-15

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Solution for r+1=-3r-15 equation: 



r+1=-3r-15

We move all terms to the left:

r+1-(-3r-15)=0

We get rid of parentheses

r+3r+15+1=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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