I need help with these math questions extraneous solution #9

given the function
[tex]4x-17=\frac{15}{x}[/tex]solving for x
[tex]x(4x-17)=15[/tex][tex]4x^2-17x=15[/tex][tex]4x^2-17x-15=0[/tex][tex]4x^2-20x+3x-15=0[/tex][tex]2^2x(\frac{2^2*x^2}{2^2*x}-\frac{2^2*5x}{2^2*x})+3(\frac{3x}{3}-\frac{3*5}{3})=0[/tex][tex]2^2x(x-5)+3(x-5)=0[/tex][tex](x-5)(2^2x+3)=0[/tex][tex](x-5)(4x+3)=0[/tex]then
[tex](x-5)=0[/tex][tex]x=5[/tex]and
[tex]4x+3=0[/tex][tex]4x=-3[/tex][tex]x=-\frac{3}{4}[/tex]x = 5
x = -3/4