1-3r=13

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Solution for 1-3r=13 equation: 



1-3r=13

We move all terms to the left:

1-3r-(13)=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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