If a=-9 and b=-6, show that (a-b) unequal (b-a)

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If a=-9 and b=-6, show that (a-b) unequal (b-a)

a - b:
a - b = -9 - -6
a - b = -9 + 6
a - b = -3

b - a:
b - a = -6 - -9
b - a = -6 + 9
b - a = 3

Since -3 <> 3, then a - b <> b - a