251
5,4у=-32,94
у=(-32,94)/5,4=-6,1
проверка
5,4(-6,1)=-32,94
-32,94=-32,94 верно
7 11 13
--- х + --- = ----
9 12 18
7 11 13
--- х = - --- + ----
9 12 18
28 33 26
---- х= - ----- + ------
36 36 36
28 7
----- х = - -----
36 36
7 28
х= - ------- / ------
36 36
1
х= - -----
4