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8(-8-6r)=-400r
We move all terms to the left:
8(-8-6r)-(-400r)=0
We add all the numbers together, and all the variables
8(-6r-8)-(-400r)=0
We multiply parentheses
-48r-(-400r)-64=0
We get rid of parentheses
-48r+400r-64=0
We add all the numbers together, and all the variables
352r-64=0
We move all terms containing r to the left, all other terms to the right
352r=64
r=64/352
r=2/11
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