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.