6=84-12r

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Solution for 6=84-12r equation: 



6=84-12r

We move all terms to the left:

6-(84-12r)=0

We add all the numbers together, and all the variables

-(-12r+84)+6=0

We get rid of parentheses

12r-84+6=0

We add all the numbers together, and all the variables

12r-78=0

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

12r=78

r=78/12

r=6+1/2

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