asta stim
a+b+c+d=168.599
a=112.130
a+b=125.442
c=21.023
din a=112.130 si a+b=125.442 aflam pe b 112.130+b=125.442
b=125.442-112.130=13.312
din a+b+c+d=168.599 aflam pe d
112.130+13.312+21.023+d=168.599 d=168.599-112.130-13.312-21.023=22.134
112.130+13.312+21.023+22.134=168599