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-8(2-r)=24
We move all terms to the left:
-8(2-r)-(24)=0
We add all the numbers together, and all the variables
-8(-1r+2)-24=0
We multiply parentheses
8r-16-24=0
We add all the numbers together, and all the variables
8r-40=0
We move all terms containing r to the left, all other terms to the right
8r=40
r=40/8
r=5
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