x + 3 = 9, 12, 7, 6, 13, B + 7 = 20, 27, 18, 16, 13, x − 7 = 10, 24, 3, 17, 13, x − 15 = 25, 10, 40, 25, 17, A − 20 = 40, 60, 20, 40, 30, 18 + x = 35, 20, 17, 15, 14, 75 − C = 30, 45, 60, 30, 25, 12 + x = 20, 14, 8, 22, 10, x + 45 = 100, 50, 40, 55, 35, x + 12 = 25 + 8, 15, 7, 18, 21

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