Réponses

2014-10-03T19:36:03+02:00
3 / 7x = - 8 ( 5x - 7 )
3 / 7x = - 8 * 5x - 8 * ( - 7 )
3 / 7x = - 40x + 56
3 / 7x + 40x = 56
283 / 7x = 56
x = 392 / 283