(6,97х-13,2х)*(-100/89)=-47/9-10/3
(6,97x-13,2x)*(-100//89)=-47//9-10//3 -6.23x*(-100//89)+47//9+10//3=0 -(-7x)+47//9+10//3=0 7x+77//9=0 x=-(77//9)/7 x=-11//9 x=-1 2//9 // - черта дроби