Упростите выражение!
(-5x - 3y)(-8x + 1) - (-8x - 2y)(-3x + 9) = 40x² + 24xy - 5x - 3y - (24x² + 6xy - 72x - 18y) = 40x² + 24xy - 5x - 3y - 24x² - 6xy + 72x + 18y = 16x² + 18xy + 67x + 15y