resoudre chaque équation : a)5x = -20 b)5+x = -20 c)x sur 5 = -20 d)x+8 = 0 e)9x = 0 f)3x-7 = 0

Bonjour,

Résoudre chaque équation :

a)5x = -20

5x/5 = -20/5

• x = -4

b)5+x = -20

5 + x - 5 = -20 - 5

• x = -25

c)x sur 5 = -20

x/5 * 5 = -20 * 5

• x = -100

d)x+8 = 0

x + 8 - 8 = 0 - 8

• x = -8

e)9x = 0

9x/9 = 0/9

• x = 0

f)3x-7 = 0

3x - 7 + 7 = 0 + 7

3x = 7

3x/3 = 7/3

• x = 7/3