2(r-4)=12

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



2(r-4)=12

We move all terms to the left:

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

We multiply 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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