\(\left(5x-16\right).6561=2.177147\\ \left(5x-16\right).6561=354294\\ 5x-16=354294:6561\\ 5x-16=54\\ 5x=54+16\\ 5x=70\\ x=14\)
\(\left(5x-2^4\right).3^8=2.3^{11}\)
\(\left(5x-16\right).6561=354294\)
\(\left(5x-16\right)=354294:6561=54\)
\(5x=54+16=70\)
\(x=70:5\)
\(x=14\)