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x = - 3 ⇒ f(-3) = - (-3) + 3 = 6
x = - 1 ⇒ f(-1) = - (-1) + 3 = 4
x = 1 ⇒ f(1) = - 1 + 3 = 2
x = 3 ⇒ f(3) = - 3 + 3 = 0
x = 5 ⇒ f(5) = - 5 + 3 = - 2
x = 7 ⇒ f(7) = - 7 + 3 = - 4
Range = {- 4, - 2, 0 , 2, 4, 6}