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Upc Code Digit Calculation

The UPC code, made up of numbers and dashes, on a video tape is 9-78094-11006-$ x $. The digit $ x $ is in the $ 12^{\mathrm{th}} $ position. Let $ n $ be the value obtained by adding the digits in the odd positions, tripling that sum, and then adding the digits in the even positions. A valid UPC code is such that $ n $ is divisible by 10. For what value of $ x $ will this UPC code be valid?

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+
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-
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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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