C'est équations, merci d'avance. ​

 Bonjour,

a)

8x -10 = 4+x

8x-4x = 4+10

4x = 14

x= 14/4 =3,5

=> faux

b)

2x+16 +3 = 4-3x

2x+3x = 4-16 -3

5x = -15

x= -15/5 = -3

=> vrai

c)

12x-1 = 10x -10 +1

12x -10x = -10 +1 +1

2x = -8

x= -8/2 = -4

=> vrai

d)

x² -6x +9 = x² -5x

x² -x² -6x +5x = -9

-x =-9

x = 9

=> vrai