5r-9=3r+12

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Solution for 5r-9=3r+12 equation: 



5r-9=3r+12

We move all terms to the left:

5r-9-(3r+12)=0

We get rid of parentheses

5r-3r-12-9=0

We add all the numbers together, and all the variables

2r-21=0

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

2r=21

r=21/2

r=10+1/2

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