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Sagot :

Bonjour,

3x +3 = 123

3x= 123 -3

3x = 120

x= 120/3 =40

8x -20 =84

8x = 84+20

8x= 104

x= 104/8 =13

6x-2x = 9

4x= 9

x= 9/4

x=2,25

WIWITIGER72

Réponse:

a. 3x+3=123

3x+3-3=123-3

3x=120

3x÷3=120÷3

x=40

b. 8x-20=84

8x-20+20=84+20

8x=104

8x÷8=104÷8

x=13

c. 6x-2x=2x+9-2x

4x=9

4x÷4=9÷4

x=9÷4

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