solve (1.5-1)[1/(-30)-1/60] please
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(1.5-1)[1/(-30)-1/60] = (0.5)[1/(-30)-1/60 = 0.5 x [(-2)/60-1/60] = 0.5 x [(-3)/60] = 0.5 x (-1)/20 = -0.025
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