4r+9=13r+18

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Solution for 4r+9=13r+18 equation: 



4r+9=13r+18

We move all terms to the left:

4r+9-(13r+18)=0

We get rid of parentheses

4r-13r-18+9=0

We add all the numbers together, and all the variables

-9r-9=0

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

-9r=9

r=9/-9

r=-1

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