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4(2-4r)=-104
We move all terms to the left:
4(2-4r)-(-104)=0
We add all the numbers together, and all the variables
4(-4r+2)-(-104)=0
We add all the numbers together, and all the variables
4(-4r+2)+104=0
We multiply parentheses
-16r+8+104=0
We add all the numbers together, and all the variables
-16r+112=0
We move all terms containing r to the left, all other terms to the right
-16r=-112
r=-112/-16
r=+7
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