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Meilleure réponse !
2012-11-11T16:34:00+01:00

-5x/7 + 23 = 21

-5x / 7 = 21 - 23

-5x/7 = - 2 

-5x = -2 *7

-5x = -14

x = -14 / (-5)

x = 14/5

2012-11-11T16:41:17+01:00

-5x/7 = 21-23

-5x/7 = -2

-5x = -2X7

-5x = - 14 

x = -14/-5 donc 14/5