y= ((2x-5)^-1 ) * (x^(2)-5x)^6

this is what i have so far

dy/dx=

(2x-5)^-1 * 6(x^2-5x)^5 * (2x-5) * 2 +

(x^2-5x)^6 * -1(2x-5)^-2 * 2

cancel the (2x-5) in the first term right

so then i have

12(x^2-5x)^5- 2(x^2-5x)^6 * (2x-5)^-2

factor out 2(x^2-5x)^5

so i have

2(x^2-5x)^5 [ 6-(x^2-5x)*(2-5)^-2]

now i am confused how to simplify this