x+3%*x+5%(x+3%x)=86,52
x+[tex] \frac{3x}{100} + \frac{1}{20} (x+ \frac{3x}{100} )=86,52[/tex]
[tex] \frac{100x+3x}{100} + \frac{1}{20} * \frac{103x}{100} =86,52[/tex]
[tex] \frac{2060x+103x}{2000} =86,52
[/tex]
[tex] \frac{2163x}{2000} =96,52[/tex]
2163x=173040
x=80