Charmaine bought a total of 18 packs x 8 cans/pack = <<18*8=144>>144 cans of cola.
The total number of cans that are left is 144 cans - 9 cans = <<144-9=135>>135 cans. Answer: \boxed{135}.
Charmaine bought 18 packs of cola. Each pack had 8 cans. She drank 9 of the cans. How many cans are left?
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