Remember that:
$\log_3{x}$$=x$
$\log{x}$$=x$
$\ln{x}$$=x$
Solve for $x$.
$\log_3{x}=4$
$\log_3{x}$$=$ $4$
$=$
Solve for $x$.
$\log{\left(3x+4\right)}=2$
$\log{\left(3x+4\right)}$$=$ $2$
$3x+4=$
$x=$
Solve for $x$.
$\ln{3x}=2\ln{4}$
$\ln{3x}=\ln$
$\ln{3x}$$=$ $\ln{16}$
$3x=$
$x=$