Răspuns:
300-b:14+(7×4+15×20):8=346
300-b:14+(28+300):8=346
300-b:14+328:8=346
300-b:14+41=346
300-b:14=346-41
300-b:14=305
b:14=300-305
b:14=-5
b=-5×14
b=-70
