8b = 64, b = 5, b = 6, b = 7, b = 8, D2 = 100, d = 50, d = 10, d = 5, d = 12, 5a = 60, a = 10, a = 5, a = 13, a = 12, 4x - 1 = 23, x = 5, x = 6, x = 7, x = 8, 3k + 6 = 33, k = 9, k = 10, k = 11, k = 12, 20 - f = 9, f = 9, f = 8, f = 11, f = 10, 12y - 8 = 40, y = 3, y = 4, y = 8, y = 10, 2x + 10 = 6, x = 4, x = 2, x = -4, x = -2, 4d - d = 30, d = 7.5, d = 10, d = 8, d = 11, 4x + 3 = 2x + 11, x = 4, x = 5, x = 6, x = 7

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