7r-9=4r

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Solution for 7r-9=4r equation: 



7r-9=4r

We move all terms to the left:

7r-9-(4r)=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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