Tìm x biết4. (x – 3) = 7^2 – 1^10

4. (x – 3) = 7² – 1¹⁰

4. (x – 3) = 49 – 1

4. (x – 3) = 48

x – 3 = 48 : 4

x – 3 = 12

x = 12 + 3

x = 15

Vậy x = 15