Đáp án:
`x = 3`
Giải thích các bước giải:
`(3/2)^(x + 1) - (3/2)^x = 27/16`
`-> (3/2)^x . 3/2 - (3/2)^x = 27/16`
`-> (3/2)^x . (3/2 - 1) = 27/16`
`-> (3/2)^x . (3/2 - 2/2) = 27/16`
`-> (3/2)^X . 1/2 = 27/16`
`-> (3/2)^x = 27/16 : 1/2`
`-> (3/2)^x = 27/16 . 2`
`-> (3/2)^x = 27/8`
`-> (3/2)^x = (3/2)^3`
`-> x = 3`