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4(7+4r)-4=104
We move all terms to the left:
4(7+4r)-4-(104)=0
We add all the numbers together, and all the variables
4(4r+7)-4-104=0
We add all the numbers together, and all the variables
4(4r+7)-108=0
We multiply parentheses
16r+28-108=0
We add all the numbers together, and all the variables
16r-80=0
We move all terms containing r to the left, all other terms to the right
16r=80
r=80/16
r=5
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