`a) 5 . x^3 = 5 . 4^3`

`x^3 = 4x^3`

`x = 4`

Vậy `x = 4`

`c) 3/4 x^12 = 3/4 . 5^12`

`x^12 = 5^12`

`x = 5` hoặc `x = -5`

Vậy `x = 5` hoặc `x = -5`

`e) x^9 = 2 . 2^8`

`x^9 = 2^9`

`x= 2`

Vậy `x = 2`

`g) 5 . 3^x = 7 . 3^5 - 2 . 3^5`

`5 . 3^x = (7-2) . 3^5`

`5 . 3^x = 5 . 3^5`

`3^x = 3^5`

`x = 5`

Vậy `x = 5`

`i) x^10 = 4 . 4^10 - 3 . 4^10`

`x^10 = (4 - 3) . 4^10`

`x^10 = 4^10`

`x = 4` hoặc `x = -4`

Vậy `x = 4` hoặc `x = -4`

`k) 7 . x^8 = 2^9 + 5 . 2^8`

`7 x^8 = 2^8 . 2 + 5 . 2^8`

`7 x^8 = (2+5) . 2^8`

`7 x^8 = 7 . 2^8`

`x^8 = 2^8`

`x = 2` hoặc `x = -2`

Vậy `x = 2` hoặc `x = -2`

`m) 5 . (x+6)^5 = 2 . 3^5 + 3 . 3^5`

`5 . (x+6)^5 = 3^5 . (2 + 3)`

`5 . (x+6)^5 = 3^5 . 5`

`(x+6)^5 = 3^5`

`x + 6 = 3`

`x = 3 - 6`

`x = -3`

Vậy `x = -3`

`o) (x+1)^3 + 4 (x + 1)^3 = 5 . 3^6`

`(1 + 4) (x+1)^3 = 5 . (3^2)^3`

`5 (x+1)^3 = 5 . 9^3`

`(x+1)^3 = 9^3`

`x + 1 = 9`

`x = 9 - 1`

`x = 8`

Vậy `x =  8`