12+7= - 19, 20-9= - 11, 6+14= - 20, 18-14= - 4, 7+8= - 15, 1+13= - 14, 17-5= - 12, 11+2= - 13, 10-7= - 3, 16-5= - 11, 10+10 = - 20, 50-20 = - 30, ­x10 = 100 - 10, 80/2 = - 40, 30+ ­ -70= 60 - 100, 125+44= - 169, 800+115= - 915, 1050-23= - 1027,

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