Bicycles have 2, tricycles and motor bikes with sidecars have 3 - so the question is based on an incorrect premise.
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8-6+4=6. But 8-(6+4)=-2
-4 + 6 + 8 = 10
(1/6) + (4/6) + (4/8) = (5/6) + (4/8) = (5/6) + (3/6) = 8/6 = 4/3 = 1 and 1/3
very easily! 4 + 6 + 6 + 8
6/8 = 3/4 8/6 = 4/3