Question

Answer 1

\(\Leftrightarrow\left\{{}\begin{matrix}-2x>=7\\-x< 5\\1-2x-3x-6< =0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x< =-\dfrac{7}{2}\\x>-5\\x>=-1\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}-5< x< =-\dfrac{7}{2}\\x>=-1\end{matrix}\right.\Leftrightarrow x\in\varnothing\)

Answer 2

\(\left\{{}\begin{matrix}3x-10\ge5x-3\\x< 2x+5\\\dfrac{1-2x}{3}\le x+2\end{matrix}\right.\)

\(\Leftrightarrow\) \(\left\{{}\begin{matrix}x\le\dfrac{-7}{2}\\x>-5\\x\ge-1\end{matrix}\right.\)

\(\Leftrightarrow\) \(x\in\phi\)

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