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-4,3+(-7,1)=-4,3-7,1=-11,4
-2¾+(1⅞)=-11/4+15/8=-22/8+15/8=-7/8
4⅔+(-1⅓)=14/3-4/3=10/3=3⅓
(-1½)+3=-1½+3=-3/2+3/1=-3/2+6/2=3/2=1½
(-2½)+(+2,5)=-2½+2 5/10=-5/2+2½=-5/2+5/2=0
(-4,5)+(-5,5)=-4 5/10-5 5/10=-4½-5½=-9/2-11/2=-20/2=-10