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System of Equations Solutions

For what value of the constant $ a $ does the system of equations below have infinitely many solutions? \begin{align*} 2x + 5y &= -8,\\ 6x &= 16 + a - 15y \end{align*}

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

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

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