Varify (a+b)+c=a+(b+c) for a=-2,b=9,c=-18
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Step-by-step explanation:
LHS=(a+b)+c
= (-2+9)+(-18)
= 7-18
= -11
RHS =a+(b+c)
= -2+(9-18)
= -2-9
= -11
LHS= RHS
Verified....
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