1 x 1 = - 1, 2 x 100 = - 200, 35 x 10 = - 350, 100 - 70 = - 30, 60 - 35 = - 25, 1 x 2 x 5 = - 10, 6 + 6 = - 12, 50 - 30 - 10 - 5 = - 5, 20 x 100 = - 2000, 50 x 2 - 10 = - 90,

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