9+0.5r=12.

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Solution for 9+0.5r=12. equation: 



9+0.5r=12.

We move all terms to the left:

9+0.5r-(12.)=0

We add all the numbers together, and all the variables

0.5r+9-12=0

We add all the numbers together, and all the variables

0.5r-3=0

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

0.5r=3

r=3/0.5

r=6

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