Bonjour
résoudre ces équations :
5x-6=3x
5x - 6 + 6 = 3x + 6
5x - 3x = 3x + 6 - 3x
2x = 6
2x/2 = 6/2
x = 3
x +19=3x
x + 19 - x = 3x - x
19 = 2x
2x/2 = 19/2
x = 19/2
x = 9,5
3x-9=-3-4x
3x - 9 + 9 = -3 - 4x + 9
3x + 4x = 6 - 4x + 4x
7x = 6
7x/7 = 6/7
x = 6/7
8x-16=-9x+3
8x - 16 + 16 = -9x + 3 + 16
8x + 9x = -9x + 19 + 9x
17x = 19
17x/17 = 19/17
x = 19/17
