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-5r-3(8-5r)=-104
We move all terms to the left:
-5r-3(8-5r)-(-104)=0
We add all the numbers together, and all the variables
-5r-3(-5r+8)-(-104)=0
We add all the numbers together, and all the variables
-5r-3(-5r+8)+104=0
We multiply parentheses
-5r+15r-24+104=0
We add all the numbers together, and all the variables
10r+80=0
We move all terms containing r to the left, all other terms to the right
10r=-80
r=-80/10
r=-8
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