6х²-(5х+1)(х+3)=(х+3)(х-5)+2 Плиз !!!
6х²-(5х²+15х+х+3) = 2+(х²-5х+3х-15) 6х²-5х²-15х-х-3 = 2+х²-5х+3х-15 х²-16х-3=х²-2х-13 х²-х² -16х+2х = -13+3 -14х=-10 | * (-1) 14х=10 х = 5/7