9r+13=2r-1

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Solution for 9r+13=2r-1 equation: 



9r+13=2r-1

We move all terms to the left:

9r+13-(2r-1)=0

We get rid of parentheses

9r-2r+1+13=0

We add all the numbers together, and all the variables

7r+14=0

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

7r=-14

r=-14/7

r=-2

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