10r-9=13r+9

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Solution for 10r-9=13r+9 equation: 



10r-9=13r+9

We move all terms to the left:

10r-9-(13r+9)=0

We get rid of parentheses

10r-13r-9-9=0

We add all the numbers together, and all the variables

-3r-18=0

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

-3r=18

r=18/-3

r=-6

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