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é so isolar a linha com a igualdade
![\\ \left[\begin{array}{ccc}x&4\\4&1\\\end{array}\right] \\ \\ x+4=0 \\ x=-4 \\
\left[\begin{array}{ccc}2&3&-2\\0&1&x\\2&x&-3\end{array}\right] \\ \\ 0+1+x=-2 \\ x=-3](https://tex.z-dn.net/?f=%0A%5C%5C+%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Dx%26amp%3B4%5C%5C4%26amp%3B1%5C%5C%5Cend%7Barray%7D%5Cright%5D+++%5C%5C+%5C%5C+x%2B4%3D0+%5C%5C+x%3D-4+%5C%5C+%0A%0A++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D2%26amp%3B3%26amp%3B-2%5C%5C0%26amp%3B1%26amp%3Bx%5C%5C2%26amp%3Bx%26amp%3B-3%5Cend%7Barray%7D%5Cright%5D++%5C%5C++%5C%5C+0%2B1%2Bx%3D-2+%5C%5C+x%3D-3 "\\ \left[\begin{array}{ccc}x&4\\4&1\\\end{array}\right] \\ \\ x+4=0 \\ x=-4 \\
\left[\begin{array}{ccc}2&3&-2\\0&1&x\\2&x&-3\end{array}\right] \\ \\ 0+1+x=-2 \\ x=-3")
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