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5 = c
5/5 = 1 = c/5
9 = 9 times that = 9c/5

Example: c = 10
so 5 cost 10 then 1 cost 2
then using 9c/5 it is
9x10 / 5 = 9x2 / 1 = 18/1 = 18

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7y ago

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