which property is used for x=4/5,y=-2/3 and z=3
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Associative law is used.
L.H.S
x + y = 4/7 + (-5/21)
taking L.C.M
x + y = 12/21 - 5/21 =7/21 or 1/3
(x + y) + z = 1/3 + 1/3 = 2/3
R.H.S
y + z = -5/21 + 1/3
taking L.C.M
y + z = -5/21 + 7/21 = 2/21
x + (y + z) = 4/7 + 2/21
taking L.C.M
12/21 + 2/21 = 14/21 = 2/3
Now,
L.H.S = R.H.S
Hence verified.
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