r=3,12-r

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Solution for r=3,12-r equation: 



r=3.12-r

We move all terms to the left:

r-(3.12-r)=0

We add all the numbers together, and all the variables

r-(-1r+3.12)=0

We get rid of parentheses

r+1r-3.12=0

We add all the numbers together, and all the variables

2r-3.12=0

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

2r=3.12

r=3.12/2

r=1+1/1.7857142857143

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