\(\left[\begin{matrix}4x+7658=3x+9854\\4x+7658=-3x-9854\end{matrix}\right.\)\(\Leftrightarrow\)\(\left[\begin{matrix}x=2196\\7x=-17512\end{matrix}\right.\) \(\Leftrightarrow\ \)\(\left[\begin{matrix}x=2196\\x=2501\frac{5}{7}\end{matrix}\right.\)
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