Д=14²-4*3*(-40)=676
х=-14±26/6
х=-14+26/6=2
х=-14-26/6=-20/3
Ответ х1=-20/3 , х2=2
8b+6a=2(4b+3a)
Проверка:2*4b=8b;
2*3a=6a