Comment je dois le calculer

(-3x/4-2/5) = 0
-3x/4 = 2/5
-x = 2/5 divisé par 3/4
-x = 8/15
x = 8/15

3+x = 0
x = -3

x³-7x+6 = 0
(x-2)(x-1)(x+3) = 0

x-2 = 0
x = 2

x-1 = 0
x =1

x+3 = 0
x =-3