Aufgabe 3 d)

 

 

  (17 – 5x)              =        (16x – 21)             Anwendung der Strategie 3; Hauptnenner = 21

 

   (17 – 5x)   =        (16x – 21)

 

3 – 14 (17 – 5x)           =       33 (16x – 21)

 

3 – 238 + 70x               =       528x – 693

 

235 + 70x                      =       528x – 693           | + 235

 

             70x                     =       528x – 458           | – 528x

 

             -458x                 =                - 458             | : -458

 

                   x                    =                    1