12=5r+4-r

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Solution for 12=5r+4-r equation: 



12=5r+4-r

We move all terms to the left:

12-(5r+4-r)=0

We add all the numbers together, and all the variables

-(4r+4)+12=0

We get rid of parentheses

-4r-4+12=0

We add all the numbers together, and all the variables

-4r+8=0

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

-4r=-8

r=-8/-4

r=+2

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