If a = -9, b = -6 and c = 8, Verify that (a + b) + c = a + (b + c).
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(a+b)+c=a+(b+c)
{(-9)+(-6)}+8=-9+{(-6)+(8)}
(-15)+8=-9+(2)
-7=-7
{(-9)+(-6)}+8=-9+{(-6)+(8)}
(-15)+8=-9+(2)
-7=-7
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