for Melody

Thank you 

This was my first step in this forum ,sorry

Hi Bergziege46,     

Ok, now I understand what you were asking.

this is what you originally asked me

3/5z-2b=0 
z=0,3/b ??? dieses Ergebnis habe ich nicht vorgegeben z=3/10b?? 

I did not understand that

z=0,3/b ??? dieses Ergebnis habe ich nicht vorgegeben z=3/10b?? 

was a part of your answer - I thought it was a part of the question.    

Plus

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Z = 0, 3/b?? in diesem Ergebnis Habe Ich Nicht Vorgegeben Z = 3/10 b??

war ein Teil Ihrer Antwort - ich dachte, es war ein Teil der Frage.

Plus

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3/5z-2b=0        means

(3/5)z-2b=0

BUT,   what you wanted was

ABER, was du wolltest war

3/(5z)-2b=0

It is a different question.  Brackets are very important!  :))

Es ist eine andere Frage. Klammern sind sehr wichtig! :))

That is ok 

If you have learned a little about brackets and order of operation than I am very pleased :)