verify (a+b)+c = a+(b+c) where a=-2,b=-3/7and c =8/5
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Here, (a+b)+c=a+(b+c)
(-2+(-3/7)+8/5= -2+(-3/7+8/5)
= (-2-3/7)+8/5= 2+(-15+56/35)
= -5/7+8/5 = 2+(41/35)
= -25+56/35=70+41/35
= 31/35 = 111/35
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