23-28=-5, -12+3=-9, 26+(-29)=-3, -7+10=3, 27+(-13)=14, -9+4=-5, -15-5=-20, 11-23=-12, -12+18=6, -8+(-6)=-14, 21-28=-7, -5-(-7)=2, -37+21=-16, 16-9=7, -23-6=-29, -44+16=-28, -12+(-2)=-14, 34-42=-8, 17-(-7)=24, -32+40=8, -26-9=-35, 0-18=-18, -12+(-6)=-18, 27-28=-1