18r-19=13r-9

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Solution for 18r-19=13r-9 equation: 



18r-19=13r-9

We move all terms to the left:

18r-19-(13r-9)=0

We get rid of parentheses

18r-13r+9-19=0

We add all the numbers together, and all the variables

5r-10=0

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

5r=10

r=10/5

r=2

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