3=-13-r

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Solution for 3=-13-r equation: 



3=-13-r

We move all terms to the left:

3-(-13-r)=0

We add all the numbers together, and all the variables

-(-1r-13)+3=0

We get rid of parentheses

1r+13+3=0

We add all the numbers together, and all the variables

r+16=0

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

r=-16

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