Bonjour,je bloque, quelqu'un peu m'aider si il vous plait?

a) x/3 -x/4 = -6/5 => 1/12x = -6/5 => x = -72/5

b) (25-7)/40.x =3/10 => 18/40x = 3/10 => x = 1/3

c) x/7 = -2/7 => x = -2

d) 2/5x - 3/9x = 1/9 + 4/5 => (18-15)/45.x 41/45 => 3x = 41 => x = 41/3