1). 2а-(-4а-(-14а+6а)) =2a+4a-14a+6a= -2a
2а-(-4а-(-14а+6а) ) = 2а-(-4а+14а-6а) = 2а+4а-14а+6а= 12а-14а= -2а
2а-(-4а-(-14а+6а)) =-2a1)-14а+6а=-8a 2)-4a-(-8a)=-4a+8a=4a 3)2a-4a=-2a
2а+4а-14а+6а=-2а