Répondre :

1) x-5/4= 4/3

x-5-4 + 5/4 = 4/3+5/4
= x= 4x4/4x3 + 5x3/4x3
= x = 16/12+ 15/12
= x = 31/12


2) x+7/3= 5/7
= x+7/3-7/3= 5/7-7/3
= x = 5x3/7x3 - 7x7/3x7
= x =15/21 - 49/21
= x = -34/21

x-5/4=4/3

x=4/3+5/4=16/12+15/12=31/12

 

x+7/3=5/7

x=5/7-7/3=15/21-49/21=-34/21

 

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