Réponses

2013-02-23T18:48:36+01:00
7(x-8)-(9-9x)=-65 7x-56-9+9x=-65 16x-65=-65 16x=0 x=0
2013-02-23T18:58:44+01:00

7(x-8)-(9-9x)=-65

7x-56-9+9x=-65

16x-65=-65

16x=0

  x=0