Verify that (a+b) +c=a+(b+c) by taking. (a). a=-2/3 and b=-3/7
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Given :
(a+b) + c = a+(b+c)
a = -2/3 , b = - 3/7
[ { ( - 2/3) + ( -3/7) } + c ] = [ (-2/3 ) + { ( -3/7) +c } ]
[ - {(14+9)/21} + c ] = [ -{(14+9)/21} +c]
(-23/21) + c =(-23/21) + c
c = c
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