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Negative 10
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10 minus -20 is 30.
-5 + (-4) - 12 - 20 - (-10) + 6 = -25
20 + 10 - 31 + 30 - 5 = 24
Answer : 130
Since LCM(4, 5, 10) = 20, 1/4 - 2/5 - 3/10 = 5/20 - 8/20 - 6/20 = -9/20