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b) -10/3*-21/4 - 9= 35/2 -9 = 17/2
c) 2/5 * -5/8 - 14/3*-3/10 = -1/4 + 14/10 = 28/20 - 5/20= 23/20
d) -15/4*-4/3 -9 = -4