55+55= - 110, 70+70= - 140, 100+120= - 220, 300 x 2= - 600, 500 x 5= - 2500, 800 x 2= - 1.600, 30 - 15= - 15, 50-25= - 25, 3.000-2.000= - 1.000,

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