(720+е)*501=365730
360720+501*е= 365730
501е= 365730- 360720
501е=5010
е=5010:501
е=10
(720+10)*501=365730
365730=365730
720*501=360720
365730-365720=10
(720+е)*501=365730
360720+501*е= 365730
501е= 365730- 360720
501е=5010
е=5010:501
е=10
(720+10)*501=365730
365730=365730
720*501=360720
365730-365720=10
(720+10)*501=365730