Verify that x+(y+z)=(x+y)+z if x= -3/5, y= -7/10 and z= -8/15
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if x= -3/5, y= -7/10 and z= -8/15
then ,
x+(y+z)=(x+y)+z
-3/5 +(-7/10 - 8/15) = (-3/5 - 7/10) - 8/15
-3/5 +[(-21 - 16)/30] = [(-6 - 7)/10] - 8/15
-3/5 -37/30 = -13/10 - 8/15
(-18 - 37)/30 = (-39- 16)/30
-55/30 = -55/30
L.H.S = R.H.S
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