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-18 - 54 = -72
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8/18 = 24/54; 5/27 = 10/54; 24/54 + 10/54 = 34/54 = 17/27
You must find a common denominator. 6x9=54 5x9= 45/54 5x6=30/54 answer=15/54 or 5/18 in lowest form
(-54) - 23 = -77
54 - 2 = 52
54 - 38 = 16