13+13= - 26, 24+15= - 39, 36+13= - 49, 28-7= - 21, 35-10= - 25, 28-13= - 15, 45-15= - 30, 34-23= - 11, 49-13= - 36, 35+23= - 58, 76-4= - 72, 88-15= - 73, 77+12= - 89, 50+14= - 64, 58+2= - 60, 66+4= - 70, 47-13= - 34, 29-12= - 17, 51+20= - 71, 78-13= - 65, 62+14= - 76,

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