dia7

2^x=8\cdot16
2^x=\left(2^3\right)^7
2^x=8\cdot16
2^x=2^3\cdot2^4
2^x=2^{3+4}
2^x=2^7
X=7
2^x=\left(2^3\right)^7
2^x=2^{3\cdot7}
2^x=2^{21}
x=21