![\left[\begin{array}{cc}b&a\\4&a\\\end{array}\right]-2\left[\begin{array}{ccc}c&d\\a&b\end{array}\right]=\left[\begin{array}{ccc}a&c\\16&b\end{array}\right] \\\\\left[\begin{array}{cc}b&a\\4&a\\\end{array}\right]-\left[\begin{array}{ccc}2c&2d\\2a&2b\end{array}\right]=\left[\begin{array}{ccc}a&c\\16&b\end{array}\right] \\\\](/tpl/images/0975/8048/c349c.png)
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