4x(a-b)-6y(b-a)+8z(b-a) =4x(a-b)+6y(a-b)-8z(a-b) =2(a-b)(2x+3y-4z) (2a+b)(2a-3b)+a(2a+b) =(2a+b)(2a-3b+a) =(2a+b)(3a-3b) =3(2a+b)(a-b) 6(x-y)^3+15(y-x)^2-9(y-x)^3 =6(x-y)^3+15(x-y)^2+9(x-y)^3=(x-y)^2(...