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  • Utilisateur Brainly
2014-03-26T13:32:39+01:00
) 4 (x + 5) = 10x + 3
  4x+20 =10x+3
  4x-10x = -20+3
  -6x = -17
  x =17/6

b) 7x + 2 (5x + 3) = 5 (x - 3) +2
   7x+10x+6 = 5x-15+2
   12x = 19
   x =19/12
2014-03-26T13:33:40+01:00
Bonjour

a) 4 (x + 5) = 10x + 3
4x +20 = 10x +3
4x -10x = 3 -20
-6x  = -17
x = 17/6

b) 7x + 2 (5x + 3) = 5 (x - 3) + 2
7x + 10x +6 = 5x -15 +2
17x -5x = -13 -6
12x = - 19
x = -19/12