(2x-y)(y+2x)-2(3x+2y)(-2y-3x)-(11x-3y)*(2x+3y)
=4x²-y²+2(3x+2y)²-(22x²+27xy-9y²)
=4x²-y²+18x²+24xy+8y²-22x²-27xy+9y²
=-3xy+16y²