Correct: l-5l = 5, l 5 l = 5, l 8 l = 8, l-8l = 8, l 9l = 9, l-9 l = 9, l 2l = 2, l-2 l = 2, l 3 l = 3, l-3 l = 3, l 4 l = 4, l-4 l = 4, l 0 l = 0, Incorrect: l-5l = - 5, l 5 l = - 5, l 8 l = - 8, l-8 l = - 8, l 9 l = - 9, l-9 l = - 9, l 2 l = - 2, l-2 l = - 2, l 3 l = - 3, l-3 l = - 3, l 4 l = - 4, l-4 l = - 4, l 0 l = - 0,

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