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-4(2-r)=48
We move all terms to the left:
-4(2-r)-(48)=0
We add all the numbers together, and all the variables
-4(-1r+2)-48=0
We multiply parentheses
4r-8-48=0
We add all the numbers together, and all the variables
4r-56=0
We move all terms containing r to the left, all other terms to the right
4r=56
r=56/4
r=14
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