21 : x = 7, x + 350 = 600, 7 . 8 = x, 35 + x = 90, 6 . x = 48, x : 5 = 40, 780 - x = 500, x - 22 = 44, 10 000 + x = 32 000, 81 : 9 = x, 12 + 5 =, 560 - x = 330, x : 8 = 64, x . 5 = 15, 120 000 + x = 720 000.

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