83 = - 8 x 8 x 8, 53 52 54 = - 59, 32 52 = - 152, (40)7 = - 1, 103 / 108 = - 10-5, 2 x 2 x 2 x 2 x 2 - 25, 11x 11y = - 11x+y, 12-3 = - 1/123, (p5)2 = - p10, 7-2 / 77 = - 7-9, 32 94 33 9-6 - 3,

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