Bonjour,
Résoudre les équations suivantes (penser à faire la vérification et à conclure )
a) 5x+6=-9
5x + 6 - 6 = -9 - 6
5x = -15
5x/5 = -15/5
• x = -3
b)2x-7=-3x+13
2x - 7 + 3x = -3x + 13 + 3x
5x - 7 = 13
5x - 7 + 7 = 13 + 7
5x = 20
5x/5 = 20/5
• x = 4
c)-2x+7=x-3
-2x + 7 + 2x = x - 3 + 2x
7 = 3x - 3
7 + 3 = 3x - 3 + 3
10 = 3x
3x/3 = 10/3
• x = 10/3
d)4(3x-2)=9x-11
12x - 8 = 9x - 11
12x - 8 - 9x = 9x - 11 - 9x
3x - 8 = -11
3x - 8 + 8 = -11 + 8
3x = -3
3x/3 = -3/3
• x = -1
