#### Answer

$x=2$

#### Work Step by Step

Subtract $x$ and subtract $4$ on both sides, and then combine like terms to obtain:
$7x-x=16-4 \\\\ 6x=12$
Divide by 6 on both sides to obtain:
$x=\dfrac{12}{6}
\\x=2$
Check:
$\begin{array}{ccc}
&7(2)+4&=&2+16
\\&14+4 &= &18
\\&18&=&18\end{array}$