x + 5 = 12, x = 5, x = 7, x = 17, x = 8, 3x = 18, x = 3, x = 9, x = 6, x = 12, x - 4 = 10, x = 14, x = 6, x = 8, x = 10, x ÷ 5 = 5, 15, 20, 25, 10, 5x = 35, x = 5, x = 6, x= 8, x = 7, x ÷ 2 = 9, 4.5, 9, 18, 20, x + 15 = 21, x = 6, x = 5, x = 15, x = 18, x - 7 = 0, -7, 0, 7, 14, 6x = 42, x = 5, x = 6, x = 8, x = 7, x ÷ 5 = 9, 40, 45, 50, 59.

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