Sagot :
bonjour
les inconnues à gauche et les constantes à droite
4x + 7 = 2x + 13
4x - 2x = 13 - 7
2x = 6
x = 6/2
x = 3
tu as bien 4*3 + 7 = 19
et 2*3+ 13 = 5 + 13 = 19
x - 2 = 10 + 5x
x - 5x = 10 + 2
-4x = 12
x = 12/(-4)
x = -3
-3x - 8 = -7x - 4
-3x + 7x = -4 + 8
4x = 4
x = 1
2t + 5 = 5t + 12
à toi
bonjour ,
a) 4 x + 7 = 2 x + 13
4 x - 2 x = 13 - 7
2 x = 6
x = 3
b ) x - 2 = 10 + 5 x
x - 5 x = 10 + 2
- 4 x = 12
x = - 3
c ) - 3 x - 8 = - 7 x - 4
- 3 x + 7 x = - 4 + 8
4 x = 4
x = 1
d) 2 t + 5 = 5 t + 12
2 t - 5 t = 12 - 5
- 3 t = 7
t = - 7/3