Bonsoir !
x = 2/5x + 2/7 x + 66
⇔ 2/5x + 2/7 x + 66 - x = 0
⇔ 14/35x + 10/35x + 66 - 35/35x = 0
⇔ 24/35x - 35/35x + 66 = 0
⇔ - 11/35x + 66 = 0
⇔ x = - 66 * (- 35/11)
⇔ x = 210
Bonne soirée :)
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Bonsoir !
x = 2/5x + 2/7 x + 66
⇔ 2/5x + 2/7 x + 66 - x = 0
⇔ 14/35x + 10/35x + 66 - 35/35x = 0
⇔ 24/35x - 35/35x + 66 = 0
⇔ - 11/35x + 66 = 0
⇔ x = - 66 * (- 35/11)
⇔ x = 210
Bonne soirée :)