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6(r-4)=8r-40
We move all terms to the left:
6(r-4)-(8r-40)=0
We multiply parentheses
6r-(8r-40)-24=0
We get rid of parentheses
6r-8r+40-24=0
We add all the numbers together, and all the variables
-2r+16=0
We move all terms containing r to the left, all other terms to the right
-2r=-16
r=-16/-2
r=+8
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