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C-(85:5×172)=3985 si alta 9000-375×15+b=7134

Răspuns :

c-(85:5x172)=3985
c-(17*172)=3985
c=3985+2924
c=6909

9000-375x15+b=7134
9000-5625+b=7134
3375+b=7134
b=7134-3375
b=3759