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3 12/36 * (2/5 - 4/12) - 3 : 1 1/2 = 3 1/3 * (2/5 - 4/12) - 2 = 10/3 * 2/*5 - 10/3 * 4/12 - 2 = 4/3 - 20/18 - 2

= 24/18 - 20/18 - 2 = 4/18 - 36/18 = - 32/18 = - 16/9 = - 1 5/9 .  ​