(128 + 49) - x = 28, x - (133 + 75) = 32, 145 - (x + 45) = 50, (39 + x) - 27 = 22, 500 – (120 – х) = 479-99, 220 + (х - 120) =997 -736, 472 – (z - 444) = 302, 6x + 131 = 437, 490 – y · 7 = 350, k : 16 – 109 = 231, 8 · (х - 7) = 1080, (k + 11): 23 = 27, 900 : (210 +х) =36, 40 + х : 70 = 54, 142 – (123 - х) + 14 =111, 67 – 36 : х = 55.

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