-16+13=9+3r

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Solution for -16+13=9+3r equation: 



-16+13=9+3r

We move all terms to the left:

-16+13-(9+3r)=0

We add all the numbers together, and all the variables

-(3r+9)-16+13=0

We add all the numbers together, and all the variables

-(3r+9)-3=0

We get rid of parentheses

-3r-9-3=0

We add all the numbers together, and all the variables

-3r-12=0

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

-3r=12

r=12/-3

r=-4

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