(3а-4ах+2)-(11а-14ах)=
3а-4ax+2-11a+14ax=-2a(4-6x)+2 -8a+10ax+2 -2a(4-5x)+2
(3a - 4ax+2) - (11a - 14ax) = 3a - 4ax + 2 - 11a +14ax=10ax - 8a + 2= = 2*(5ax - 4a +1)