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Réponse :

Explications étape par étape

Bonjour

A1

x+13x = 5-12

14x = -7

x= -7/14 -1/2

A2)

7x-3x = 2+8

10x = 10

x = 10/10 = 1

B)

5+13,5 -12 +7,5 = x+3x +12x

14 = 16x

x = 14/16 = 7/8

C1)

x/5 = -9-11

x/5 = -20

x = -20*5 = -100

C2)

5-1/2 = x/2

10/2 -1/2 =x/2

9/2 =x/2

x=9

D1)

11x/5 =-2

11x = -2*5

11x = -10

x =-10/11

D2)

11-5 = 3x/2

6 = 3x/2

6*2 =3X

12=3x

x = 12/3 = 4

E)

3x+56 -7x +4 = 60 +x

56 +4 -60= -3x +7x +x

0 = 5x

x=0

F)

5x-10 +2-6x =7x +12

-10 +2 -12 = 7x -5x +6x

-20 = 8x

x= -20/8 = -5/2

G)

4x-4 -6 +3x =2

4x+3x = 2 +4 +6

7x = 12

x = 12/7