Solve the following set of equations using MATLAB. (a) $x_{1}+2 x_{2}+3 x_{3}+5 x_{4}=21$ [begin{aligned}& -2 x_{1}+5 x_{2}+7

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Solve the following set of equations using MATLAB.

(a) $x_{1}+2 x_{2}+3 x_{3}+5 x_{4}=21$

\[\begin{aligned}& -2 x_{1}+5 x_{2}+7 x_{3}-9 x_{4}=17 \\& 5 x_{1}+7 x_{2}+2 x_{3}-5 x_{4}=23 \\& -x_{1}-3 x_{2}-7 x_{3}+7 x_{4}=26\end{aligned}\]

(b) $x_{1}+2 x_{2}+3 x_{3}+4 x_{4}=9$

$2 x_{1}-2 x_{2}-x_{3}+x_{4}=-5$

$x_{1}-3 x_{2}+4 x_{3}-4 x_{4}=7$

$2 x_{1}+2 x_{2}-3 x_{3}+4 x_{4}=-6$

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