bonjour
x à gauche - constante à droite
3x + 3 = 5 - 5x
3x + 3 - 3 = 5 - 5x - 3
3x = 2 - 5x
3x + 5x = 2 - 5x + 5x
8x = 2
x = 1/4
puis
-5x + 15 - 15 = 17x + 6 - 15
-5x = 17x -9
-5x - 17x = 17x - 17x - 9
- 22x = - 9
x = 9/22
tu as tout :)
c) x = 1
d) x = 1/2
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bonjour
x à gauche - constante à droite
3x + 3 = 5 - 5x
3x + 3 - 3 = 5 - 5x - 3
3x = 2 - 5x
3x + 5x = 2 - 5x + 5x
8x = 2
x = 1/4
puis
-5x + 15 - 15 = 17x + 6 - 15
-5x = 17x -9
-5x - 17x = 17x - 17x - 9
- 22x = - 9
x = 9/22
tu as tout :)
c) x = 1
d) x = 1/2