4^x •2⁴=16⁵
4^x •2⁴=(2⁴)⁵
4^x •2⁴=2²⁰
==>4 la puterea X = 2²⁰:2⁴
4 la puterea X =2¹⁶
(2²) la puterea X=2¹⁶
2 la puterea 2X=2¹⁶
===>2X=16
===>X=8