Step-by-step explanation:
I will assume this is what you MEANT:
(-24x^4y^2+72x^7y^3z) /-8xy (note parentheses)
Each term in the numerator has an 'x' and a 'y' in it ....so we can 'cancel' with the x and y in the denominator to get :
(-24x^3y + 72 x^6 y^2 z ) / (-8)
now you can divide -8 into the coefficients of the numerator to get your final answer of:
3x^3 y - 9x^6 y^2 z