Consider the following systems over \(\mathbb{Q}\):
\begin{eqnarray*}
4x & = & 12 \\
3x - 1 & = & x+5 \\
5-x & = & x \\
\end{eqnarray*}
Which of the following is true?
\(x = 3\) is the unique solution.
The system has no solution.
The answer is no solution because the first equation gives \(x = 3\) while
the third equation gives \(x = 2.5\).