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3 1/7 *(-7/22) = 22/7 * (-7/22) = -1
(-1 7/8)*(-8/15) = 15/8 * 8/15 = 1
3 1/7*(-7/22)=22/7*(-7/22)=-1
-1 7/8*(-8/15)=-15/8*(-8/15)=1