Réponses

2014-10-18T17:04:44+02:00


Salut,

on a donc l'équation (1) : (1 + x) ÷ (-5 - x) = 7/6

(1) <=> (1 + x) = 7/6 * (-5 - x)

(1) <=> 1 + x = -35/6 - 7/6x

(1) <=> x + 7/6x = -35/6 - 1

(1) <=> 13x/6 = -41/6

(1) <=> 13x = -41

(1) <=> x = -41/13

A+