Выполните деление : 7)(8х-12х у+10 х^2):(-2x) за 7 класс и 8)-1.2х^2 y^2 z^3:(14.4x^2z^3)

Решите задачу:

$7) \frac{8x-12xy+10x^2}{-2x} = \frac{2x(4-6y+5x)}{-2x} =-(4-6y+5x)=-4+6y-5x=\\=6y-4-5x\\ \\ 8) \frac{-1.2x^2y^2z^3}{14.4x^2z^3}=\\ =\frac{-\frac65x^2y^2z^3}{\frac{72}5x^2z^3}=\\ =- \frac{\frac65y^2}{\frac{72}5}=-\frac65y^2*\frac5{72}=-\frac6{72}y^2=-\frac1{12}y^2\\ =$