Urgent !! Résoudre ce système : 3/4x+0=-2/5x+10

3/4x + 0 = - 2/5x + 10
3/4x + 2/5x = 10
15/20x + 8/20x = 10
23/20x = 10
23x = 200
x = 200/23

Salut !
3/4x + 2/5x = (15+8)/20x = 10
23/20x = 10
20x = 23/10
20x = 2,3
x = 2,3/20
x = 0,115

A bientôt !