12=2r+4

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Solution for 12=2r+4 equation: 



12=2r+4

We move all terms to the left:

12-(2r+4)=0

We get rid of parentheses

-2r-4+12=0

We add all the numbers together, and all the variables

-2r+8=0

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

-2r=-8

r=-8/-2

r=+4

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