Răspuns:
x=39
Explicație pas cu pas:
[tex]\frac{5}{8}[/tex] [[tex]\frac{5}{8}[/tex]+[tex]\frac{5}{8}[/tex]([tex]\frac{8x+3}{5}[/tex])]=25
[tex]\frac{5}{8}[/tex] [[tex]\frac{5}{8}[/tex]+ [tex]\frac{8x+3}{8}[/tex]]=25
[tex]\frac{5}{8}[/tex]([tex]\frac{8(x+1)}{8}[/tex])=25
[tex]\frac{5(x+1)}{8}[/tex]=25/ ·[tex]\frac{8}{5}[/tex]
x+1= 40
=> x=39
