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  • Utilisateur Brainly
2014-06-04T13:04:06+02:00
a)3x-2=7
   3x =2+7
    3x = 9
     x =3

  b)15x+3=33
     15x =-3+33
     15x = 30
      x = 2

  c)1=6x-8

     -6x =-1-8
     -6x =-9
     x = 3/2
 
2014-06-04T13:05:50+02:00
Bonjour

a) 3x -2 = 7
3x = 7 +2
3x = 9
x = 3

b) 15x +3 = 33
15x = 33 -3
15x = 30
x = 2

1 = 6x -8
1 +8 = 6x
9 = 6x
x = 9/6
x = 3/2