Solve the following set of equations using MATLAB. (a) $2 x_{1}+x_{2}+x_{3}-x_{4}=12$ $x_{1}+5 x_{2}-5 x_{3}+6 x_{4}=35$ $-7 x_{1}+3

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Solve the following set of equations using MATLAB.

(a) $2 x_{1}+x_{2}+x_{3}-x_{4}=12$

$x_{1}+5 x_{2}-5 x_{3}+6 x_{4}=35$

$-7 x_{1}+3 x_{2}-7 x_{3}-5 x_{4}=7$

$x_{1}-5 x_{2}+2 x_{3}+7 x_{4}=21$

(b) $x_{1}-x_{2}+3 x_{3}+5 x_{4}=7$

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

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

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

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