\ANG{
F"ur eine  Strecke der L"ange $x$ gilt:
$$
{x\over3} = {x+3\over 5}
$$
Konstruiere $x$.
}
\LSG{
 \beginpicture
     \setcoordinatesystem units <0.5 mm, 0.5mm> point at  0   50
     \setplotarea x from 0 to 76, y from -4 to 50 
     \plot 0 0   75  0    75   50   0   0 /
     \plot 45 0  45 30 /
     \put {$x$} at 22 -3
     \put {$3$} at 60 -3
     \put {$3$} at 47 15
     \put {$5$} at 77 25

\endpicture
}
