Hello,
A = 1/6 - 6/5 - 1/8
A = (1 * 5)(6 * 5) - (6 * 6)/(5 * 6) - 1/8
A = 5/30 - 36/30 - 1/8
A = (5 * 8)/(30 * 8) - (36 * 8)/(30 * 8) - (1 * 30)/(8 * 30)
A = 40/240 - 288/240 - 30/240
A = -278/240 = -139/120
