13-3r=7

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Solution for 13-3r=7 equation: 



13-3r=7

We move all terms to the left:

13-3r-(7)=0

We add all the numbers together, and all the variables

-3r+6=0

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

-3r=-6

r=-6/-3

r=+2

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