13=4-3r

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Solution for 13=4-3r equation: 



13=4-3r

We move all terms to the left:

13-(4-3r)=0

We add all the numbers together, and all the variables

-(-3r+4)+13=0

We get rid of parentheses

3r-4+13=0

We add all the numbers together, and all the variables

3r+9=0

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

3r=-9

r=-9/3

r=-3

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