7r-9=4r+18

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Solution for 7r-9=4r+18 equation: 



7r-9=4r+18

We move all terms to the left:

7r-9-(4r+18)=0

We get rid of parentheses

7r-4r-18-9=0

We add all the numbers together, and all the variables

3r-27=0

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

3r=27

r=27/3

r=9

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