12=2(3r-4)-4r

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Solution for 12=2(3r-4)-4r equation: 



12=2(3r-4)-4r

We move all terms to the left:

12-(2(3r-4)-4r)=0



We calculate terms in parentheses: -(2(3r-4)-4r), so:

2(3r-4)-4r

We add all the numbers together, and all the variables

-4r+2(3r-4)

We multiply parentheses

-4r+6r-8

We add all the numbers together, and all the variables

2r-8

Back to the equation:

-(2r-8)



We get rid of parentheses

-2r+8+12=0

We add all the numbers together, and all the variables

-2r+20=0

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

-2r=-20

r=-20/-2

r=+10

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