3x + 5 = 20, x = 10, x = 5, 7x - 9 = 12, x = 3, x = -3, 5x + 2 = 3x + 10, x = 8, x = 4, x + y = 10 , x - y = 4, x = 3 , y = 8, y = 3 , x = 7, 2x + 3y = 12 , x - y = 1, y = 2 , x = 3, y = 4 , x = 8, 9 - 2x = 1, x = 4, x = 2, 3x - y = 7 , 2x + y =8, y = 8 , x = 2, y = 2 , x = 3

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