Please Help!!!

How would I find for x in here

Please list all steps and explanations for I want to undersand as well.

${3}^{x+2}={7}^{x-1}$

${18}^{x}=4^{2x+1}$

$ln(x^2-48)=ln(2x)$

$logx +log(x-21)=2$

${log}_{4}(x+1)+{log}_{4}5=2$

$3ln(2x)=6$

$ln(lnx)=0$

Thank you!