12=r/2+3

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Solution for 12=r/2+3 equation: 



12=r/2+3

We move all terms to the left:

12-(r/2+3)=0

We get rid of parentheses

-r/2-3+12=0

We multiply all the terms by the denominator


-r-3*2+12*2=0

We add all the numbers together, and all the variables

-1r+18=0

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

-r=-18

r=-18/-1

r=+18

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