Bonsoir,
J'aurai besoin d'aide pour les équation suivante

Bonsoir,
a. x/3 = x/4 - 6/5
20x/60 = 15x/60 - 72/60
20x - 15x = - 72
5x = - 72
x = - 72/5
x = - 14,4
b. 5x/8 - 3/10 = 7x/40
25x/40 - 12/40 = 7x/40
25x - 7x = 12
18x= 12
x = 12/18
x = 2/3
c. 2x/7 + 3/14 = x/7 - 1/14
4x/14 + 3/14 = 2x/14 - 1/14
4x - 2x = - 1 - 3
2x = - 4
x = - 4/2
x = - 2
d. 2/5x - 1/9 = 3/9x + 4/5
18/45x - 5/45 = 15/45x + 36/45
18x - 15x = 36 + 5
3x = 41
x = 41/3.