How do I simplify this? :l

4(x+y)]/(5x^2y^3) ÷ (-2x-2y)/10

4(x+y)]/(5x^2y^3) ÷ (-2x-2y)/10 =

10 * 4 ( x + y ) / [ ( 5 x ^ 2 y ^ 3 ) * ( - 2 x - 2 y ) ] =

40 ( x + y ) / [ ( 5 x ^ 2 y ^ 3 ) * - 2 ( x + y ) ] =

40 / - 2 * 5 x ^ 2 y ^ 3 ) =

40 / - 10 ( x ^ 2 y ^ 3 ) =

- 4 / x ^ 2 y ^ 3