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-5(1-8r)+8r=-389
We move all terms to the left:
-5(1-8r)+8r-(-389)=0
We add all the numbers together, and all the variables
-5(-8r+1)+8r-(-389)=0
We add all the numbers together, and all the variables
8r-5(-8r+1)+389=0
We multiply parentheses
8r+40r-5+389=0
We add all the numbers together, and all the variables
48r+384=0
We move all terms containing r to the left, all other terms to the right
48r=-384
r=-384/48
r=-8
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