4+3(2x-7)=15x-17 gleich?

4+3(2x-7)=15x-17

4+6x-21  =15x-7          | links zusammenfassen

6x-17      =15x-7          |+17

6x           =15x+10       |-15x

-9x          =10              |:(-9)

   x          =-10/9   

   x          =-1 1/9