48+(-67)= -19
-69+84= 15
4,75+(-2,83)= 1,92
-6,5+8,23= 1,73
-7/24+5/18= -1/72
-1+4/9= -5/9
1 9/20+(-1 8/15)= -7/30
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48+(-67)= -19
-69+84= 15
4,75+(-2,83)= 1,92
-6,5+8,23= 1,73
-7/24+5/18= -1/72
-1+4/9= -5/9
1 9/20+(-1 8/15)= -7/30