Tìm x: 42.x - 84 = 168, (x: 23 + 45) . 67 = 8911, 3636 : (12x - 91) = 36

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f) 42.x - 84 = 168
g) (x: 23 + 45) . 67 = 8911
h) 3636 : (12x - 91) = 36