verify that (x+u)+z=x+(y+z) by taking. x=6/7,y=5/3,z=11/10
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LHS = (x+y)+z = (6/7+5/3)+11/10 = [(18+35)/21]/11/10 = (530+231)/210 = 761/210
RHS = x+(y+z) = 6/7+(5/3+11/10) = 6/7+[(50+33)/30] = (180+581)/210 = 761/210
Hence verified that LHS=RHS.
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