bs           = 2.5
hs           = 2 
hk           = 1.6 
ho           = 0.5 
hcuo         = 7.5 
hzw          = 0.5 
hcuu         = 6.5 
hkr          = 1
bn=5.25 
hg=hs+hk+ho+hcuo+hzw+hcuu

Di=78

syms bns bz bzs

sol=solve('24*(bns+bzs)-((Di/2)+hg)*2*pi','24*(bn+bz)-((Di/2)+hs+hk)*2*pi','bz-bzs')

cd(aktueller_pfad)

%fid=fopen([num2str(sol.bns, '%.0f') '.txt'],'w'); 
fid=fopen(text.txt,'w');
fprintf(fid,'%s%1.3f%s\r\n','laenge=',sol.bns,' m');