Помогите решить один из 2 примеров! Алгебра!

x^2/(x^2 + 7xy) : x/(x^2 - 49y^2) =

= x^2/x*(x + 7y) * (x + 7y)(x - 7y)/x =

= x^2 * (x + 7y)(x - 7y) / x*(x + 7y)*x =

= x^2/x^2 * (x + 7y)/(x + 7y) * (x - 7y) =

= 1 * 1 * (x - 7y) =

= (x - 7y) =

= ((3 - 7V2) - (9 - V2) =

= 3 - 7V2 - 9 + V2 =

= - 6 - 6V2 =

= - 6 * (1 - V2)