4r-9=3.5r-9

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Solution for 4r-9=3.5r-9 equation: 



4r-9=3.5r-9

We move all terms to the left:

4r-9-(3.5r-9)=0

We get rid of parentheses

4r-3.5r+9-9=0

We add all the numbers together, and all the variables

0.5r=0

r=0/0.5

r=0

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