-15=r+1+3r

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



-15=r+1+3r

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(4r+1)-15=0

We get rid of parentheses

-4r-1-15=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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