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-4(2-r)=12
We move all terms to the left:
-4(2-r)-(12)=0
We add all the numbers together, and all the variables
-4(-1r+2)-12=0
We multiply parentheses
4r-8-12=0
We add all the numbers together, and all the variables
4r-20=0
We move all terms containing r to the left, all other terms to the right
4r=20
r=20/4
r=5
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