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19. Alfabet... matematic": a) (9x9-6x6-a) + (13 + 28: 4) = 5 x 10+ 3; b) (99-b-3x 8) + 2x6:2 = 8x2 + 5x 10; c) (6 x 4:3 + c) : 7 = 16:4; d) (9 x 4:6 xd) - 5 x 5 = 45:9; e) (e-5 x 6 + 10 x 5) : 5 + 4 × 8 = 42; f) (96-3 x 4-5 x 8) + f-9 x 7 = 13;​