2r+9=4r-13

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Solution for 2r+9=4r-13 equation: 



2r+9=4r-13

We move all terms to the left:

2r+9-(4r-13)=0

We get rid of parentheses

2r-4r+13+9=0

We add all the numbers together, and all the variables

-2r+22=0

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

-2r=-22

r=-22/-2

r=+11

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