[tex]1) \frac{ x^{2} -9x}{x+3} = \frac{36}{x+3} ; 5)
2) \frac{ x^{2} +x}{ x^{2} -25} = \frac{15-3x}{ x^{2} -25} ;
3) \frac{5x+8}{x-1} = \frac{14x+12}{3x+15} ;
4) \frac{1}{x-4} - \frac{1}{x+6} = \frac{5}{28}.[/tex]