Упростите выражение и вычислите

([tex] \frac{5}{x-y} -\frac{5x}{y^{2}-x^{2}} [/tex])×[tex] \frac{x^{2}+2xy+y^{2}}{10x+5y} [/tex] , при x=3,5 , y= -0,5 .
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