$.
The given system of equations is
$$\left\{\begin{array}{c}
\frac{x+1}{2}+\frac{y-1}{3}=1 \\
3 x+y=7
\end{array}\right.$$
Multiplying the first equation by 6 and the second equation by 1, we get
$$\left\{\begin{array}{c}
3x+2y=6 \\
3x+y=7
\end{array}\right.$$
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