Решите данный пример

По действиям:1) [latex] \frac{3x}{(x-y)( x^{2} +xy+ y^{2} )} * \frac{( x^{2} +xy+ y^{2} )}{x+y} = \frac{3x}{(x-y)(x+y)} [/latex]2)  [latex] \frac{3}{x-y} + \frac{3x}{(x-y)(x+y)} = \frac{3x+3y+3x}{(x-y)(x+y)} = \frac{6x+3y}{(x-y)(x+y)} [/latex]3) [latex] \frac{3(2x+y)}{(x-y)(x+y)} * \frac{ (x+y)^{2} }{(2x+y)} = \frac{3(x+y)}{(x-y)} [/latex]4) [latex] \frac{3(x+y)}{(x-y)} * \frac{3}{(x+y)} = \frac{9}{(x-y)} [/latex]Ответ. [latex] \frac{9}{(x-y)} [/latex]