There are 2*8 = <<2*8=16>>16 slices of cake.
There are 16/4 = <<16/4=4>>4 slices
There are 16-4 = <<16-4=12>>12 slices left.
There are 12/3 = <<12/3=4>>4 slices given away
There are 12-4-3 = <<12-4-3=5>>5 slices of cake left.
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