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Sagot :

Bonsoir,

a)

3x = 22-7

3x = 15

x= 15/3

x= 5

b)

2x = 5-3

2x 2

x= 2/2

x=1

c)

3x-x= 13-7

2x = 6

x= 6/2

x= 3

d)

8x-2x = 20-2

6x = 18

x= 18/6

x= 3

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