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Sagot :

a) 4x = 6x -12

=> 4x-6x = -12

=> -2x = -12

x = 6

 

b) 4x+7x = 3

=>11X = 3 

=> x = 3/11

 

c) x+3 = 15

=> x = 15/3

=> x = 5

 

voila :)

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