11(y-4)+10(5-3)y=-6
11y-44+(50-30)y=-6
11y-44+20y=-6
33y=-6+44=38
y=38÷33
y=1.5/38(дробь)
25-4х^2+4xy-y^2 = (25-у^2) + (4ху-4х^2) = (5^2 - у^2) + 4х(у-х) = (5-у)(5+у) + 4х(у-х)
64a^4b^2+24a^2b^4 = 8а^2b^2(8a^2 + 3b^2)