[tex]\frac{ 2d}{d-5 } +\frac{ 1}{d-3} =3 \\ \\d-5\neq 0 \ \ and \ \ d-3 \neq 0 \\\\ d \neq 5 \ \ and \ \ d \neq 3 \\\\ D=R\setminus \left \{ 3,5 \right \}[/tex]
[tex]\frac{ 2d(d-3)+(d-5)}{(d-5) (d-3)}-3 =0 \\ \\\frac{ 2d^2-6d+ d-5-3(d-5)(d-3) }{(d-5) (d-3) } =0\\\\\frac{ 2d^2-6d+ d-5-3(d^2-3d-5d+15) }{(d-5) (d-3) } =0\\\\\frac{ 2d^2-6d+ d-5-3 d^2+9d+15d-45 }{(d-5) (d-3) } =0[/tex]
[tex]\frac{ -d^2+19d -50 }{(d-5) (d-3) } =0 \\\\ -d^2+19d -50 =0 \ \ / \cdot (-1)\\\\ d^2-19d +50 =0[/tex]
