(x+3)(2y-1) -(x+3)(3y+2) винести спільний множник за дужки.

(x+3)(2y-1) -(x+3)(3y+2)== (x+3)*((2y-1)-(3y+2)) = = (x+3)*(2y-1-3y-2) == (x+3)*(-y-3) == - (x+3)(y+3)