-(6,78-5 4/9)-(0,22-1 5/9)=0
6,78=339/50
5 4/9=49/9
339/50-49/9=3051/450-2450/450=601/450
0,22=11/50
11/50-14/9=99/450-700/450=-601/450
601/450+(-601/50)=0
-(6,78-5 4/9)-(0,22-1 5/9)=0
6,78=339/50
5 4/9=49/9
339/50-49/9=3051/450-2450/450=601/450
0,22=11/50
11/50-14/9=99/450-700/450=-601/450
601/450+(-601/50)=0