r*3-3=9

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Solution for r*3-3=9 equation: 



r*3-3=9

We move all terms to the left:

r*3-3-(9)=0

We add all the numbers together, and all the variables

r*3-12=0

Wy multiply elements

3r-12=0

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

3r=12

r=12/3

r=4

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