selmash21 10х-10у+ах-ау=10(х-у)+а(х-у)=(х-у)(10+а)
(3у-2)(5-6у)+18у^2=15у-18у^2-10+12у+18у^2=
=27у-10

kdid 10x-10y+ax-at=10(x-y)+a(x-t)    ( 3y-2)(5-6y)+18y²=15y-18y²-10+12y+18y²=27y-10