49 - 28 = - 21, 23+56 = - 79, (52+2)+30 = - 74, 27+30 = - 57, 54-30 = - 24, 57-10 = - 47, 30+7 = - 37, 51+9 = - 60, 59-9 = - 50, 59-50 = - 9, 43 - 2= - 41, 43-40 = - 3, 29+30 = - 59, 68-22 = - 46, 59-30 = - 29, (42+2) - 4 = - 40, (75-2) -30 = - 43, (12+8) + 2 = - 22, (54 - 4) - 40 = - 10, (17-2) + 15 = - 30, (28-20) + 12 = - 20,

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