12=7+3r

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Solution for 12=7+3r equation: 



12=7+3r

We move all terms to the left:

12-(7+3r)=0

We add all the numbers together, and all the variables

-(3r+7)+12=0

We get rid of parentheses

-3r-7+12=0

We add all the numbers together, and all the variables

-3r+5=0

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

-3r=-5

r=-5/-3

r=1+2/3

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