In this below expression, what would be the value of x :
$2=x+\frac{1}{1+\frac{1}{3+\frac{1}{4}}}$
[A] $\frac{21}{17}$
[B] $\frac{12}{17}$
[C] $\frac{13}{17}$
[D] $\frac{18}{17}$