4r-9=7r-18

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



4r-9=7r-18

We move all terms to the left:

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

We get rid of parentheses

4r-7r+18-9=0

We add all the numbers together, and all the variables

-3r+9=0

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

-3r=-9

r=-9/-3

r=+3

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