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. a) _X9X = 135 b) 2x_X7X = 420 c) x 3X X5 X __ = 720 d) X X X 5 = 360 e) 3 x 10 = 30 f) 11 X 13 = 143 g) __X_ = 287 h) = 4891 i) = 8633 1) X _ = 3233 11 X X X X ​