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Solve the following set of equations using matrix algebra ( [A|B] method, substitute one variable by parameter t, find general solution with parameter) and show the solution when $t=0$:

\begin{cases} x_1-x_2=4\\[6px] x_1+x_2+x_3=3 \end{cases}

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HINT: adding the two given equations we obtain $$2x_1=7-x_3$$ set now $x_3=t$ and you have the solution of your System

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