c'est le 35 et ne suivez pas la consigne il faut juste que je trouve les lettres pour demain merci

Salut,

a.
3x + 1 = 5 -x
3x + x = 5-1
4x = 4
x = 1

Solution : x = 1

b.
(2x + 1)(x-7) = 0
2x + 1 = 0
2x = -1
x = -1/2
x - 7 = 0
x = 7

Solutions : x = -1/2 ou x = 7

c.

3(4t-5) = 0
12t - 15 = 0
12t = 15
t = 15/12 = 5/4

Solution : t = 5/4

d.

2x - (x-1) = 0
2x - x + 1 = 0
x + 1 = 0
x = -1

Solution : x = -1

e.

y² - 4 = y(y+1)
y² - 4 = y² + y
y² - y² - y = 4
-y = 4
y = -4

Solution : y = -4

f.

2x(x-1) = 0
2x = 0
x = 0

x-1 = 0
x = 1
Solutions : x = 0 ou x = 1

Bonne soirée  !