(7x-2y)(3x-2y-1)-(4x+3y)(9x+6y)
=21x^2-14xy-7x-6xy+4y^2+2y-36x^2-24xy-27xy-18y^2
=-15x^2-70xy-7x-14y^2+2y
=-60+140-14-14-2
=50