100-(в*8-50)=30; 9600:(540:d-4)=600решить с проверкой

100-(в*8-50)=30                 9600:(540:d-4)=600в*8-50=100-30                    540:d-4=9600/600в*8-50=70                           540:d-4=16в*8=70+50                          540:d=16+4в*8=120                              540:d=20в=120/8                               d=540/20в=15 проверка 100-(15*8-50)=30      d=27  проверка 9600:(540:27-4)=600