решение 
(720+e)*501=365 730     5t+30-12t=42                     36*(x-3)=10-2*(x+2)

(750+e)*501==365730375750+501e=365730501e=-10020e=-205t+30-12t=42-7t=12t=1,5/736*(x-3)=10-2*(x+2)36x-108=10-2x+438x=122x=3,8/38думаю так

720+е=365 730:501720+е= 730е=730-720е=105t-12t=42-30-7t=12t=12:(-7)t= -12/7t= -1 5/736х-108=10-2х-436х+2х=10-4+10838х=114х=114:38х=3