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8(1-8r)=456
We move all terms to the left:
8(1-8r)-(456)=0
We add all the numbers together, and all the variables
8(-8r+1)-456=0
We multiply parentheses
-64r+8-456=0
We add all the numbers together, and all the variables
-64r-448=0
We move all terms containing r to the left, all other terms to the right
-64r=448
r=448/-64
r=-7
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