Bonjour,
Résoudre les équations:
a.
18x - 51 = -7x + 49
18x - 51 + 51 = -7x + 49 + 51
18x = -7x + 100
18x + 7x = -7x + 100 + 7x
25x = 100
x = 100/25
x = 4
✅
b.
4(5x - 2) - 9x = -3(8x + 6)
20x - 8 - 9x = -3(8x + 6)
11x - 2 = -3(8x + 6)
11x - 2 = -24x - 18
11x - 8 + 8 = -24x - 18 + 8
11x = -24x - 10
11x + 24x = -24x - 10 + 24x
35x = -10
x = -10/35
x = -2/7
✅
Bonne journée
