12=r.4

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Solution for 12=r.4 equation: 



12=r.4

We move all terms to the left:

12-(r.4)=0

We add all the numbers together, and all the variables

-(+r.4)+12=0

We get rid of parentheses

-r.4+12=0

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

-r.4=-12

r=-12/1

r=-12

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