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Triangle Angle Calculation

In triangle $ ABC $, the measure of angle $ A $ is $ x $ degrees, the measure of angle $ B $ is $ 2x $ degrees and the measure of angle $ C $ is $ 5x $ degrees. What is the value of $ x $? Express your answer as a decimal to the nearest tenth.

1
2
3
+
4
5
6
-
7
8
9
$\frac{a}{b}$
.
0
=
%

$a^n$
$a^{\circ}$
$a_n$
$\sqrt{}$
$\sqrt[n]{}$
$\pi$
$\ln{}$
$\log$
$\theta$
$\sin{}$
$\cos{}$
$\tan{}$

$($
$)$
$[$
$]$
$\cap$
$\cup$
$,$
$\infty$

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