2 - x+2 = 4, 3 - x+3 = 6, 4 - x-4 = 0, 5 - 5x +2 = 27, 6 - 3x + 2 = 20, 7 - 7x + 1 = 50, 8 - x : 4 = 2, 9 - x : 3 = 3, 10 - 5 * (x - 4) = 30, 11 - 3 * (x+9) = 60, 12 - x : 3 = 4, 13 - 2x + 4 = 30, 14 - 4 * (x-4) + 5 = 45, 15 - x : 3 + 4 = 9, 16 - x : 4 + 5 = 9, 17 - x - 11 = 6, 18 - x : 3 = 6, 19 - 4 * (x-7) = 48, 20 - 3 * (x-15) + 5 = 20, 21 - x : 3 = 7, 22 - 4x + 2 = 90, 23 - x + 17 = 40, 24 - x : 4 + 5 = 11, 25 - x : 5 = 5, 26 - 4 * (x-6) + 20 = 100, 27 - x : 3 = 9, 28 - 3x + 6 = 90, 29 - x + 21 = 50, 30 - x+x = 60, 1 - 5 * (x+4) + 2 = 27,

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