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Meilleure réponse !
  • Utilisateur Brainly
2014-04-13T17:23:49+02:00
a)-3(2+x)= 1-5x
-6-3x=1-5x
2x=7
x=3,5

b)4-7(2-x)=5-4x

4-14+7x=5-4x
11x=15
x=15/11
2014-04-13T17:24:17+02:00
a)-3(2+x)= 1-5x
-6 -3x = 1-5x
-3x +5x = 1 +6
2x = 7
x =7/2

b)4-7(2-x)=5-4x

4 -14 +7x = 5-4x
7x +4x = 5 -4 +14
11x = 15
x =15/11