Aider moi s’il vous plaît . C’est pour demain

5x - 7 = 8

5x - 7 + 7 = 8 + 7

5x = 15

5/5x = 15/5

x = 3

-2 = 18 + 10y

10y + 18 = - 2

10y + 18 - 18 = - 2 - 18

10y = -20

10/10y = -20/10

y = -2

idem pour le c

d

3*x + 3*(-1) = 3

3x - 3 = 3

vous finissez

e

12 - 12 - 6x = 3/2 - 12

-6x = 3/2 - 24/2

-6x = -21/2

6x = 21/2

6/6x = 21/2 /6

x = 21/2 * 1/6

x= 21/12

x = 3x7/3x4

x = 7/4

x = 1,75

f

5/3x - 2/3x = -1/5

x = -1/5

x = -0,2