6x + 3 = 21 - x = 3, 3x/5 = 9 - x = 15, (x - 6)/4 = 5 - x = 26, 9x - 6 = 39 - x = 5, 6x + 4 = 5x + 6 - x = 2, 3x + 5 = 2x - 7 - x = -12,

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