Tìm x biết: 720 : [41 – (2x – 5)] = 2³.5.

720 : [41 – (2x – 5)] = 2³.5

⇔ 720 : [41 – (2x – 5)] = 8.5

⇔ 720 : [41 – (2x – 5)] = 40

⇔ 41 – (2x – 5) = 720 : 40

⇔ 41 – (2x – 5) = 18

⇔ 46 – 2x = 18

⇔ 2x = 46 – 18

⇔ 2x = 28

⇔ x = 28 : 2

⇔ x = 14

Vậy x = 14.