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Sagot :

a) x + 3 + 5 

= x + 8

 

b) 13 + 15 - 5x 

= 28 - 5x

 

c) 7y + 9y - 18

= 16y - 18

 

d)6a + 6 + 24 + 8a

= 14a + 30

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