$a/\Leftrightarrow \left\{ \begin{array}{l} 3x-1-2x-7\geq 0\\ 4x+3-2x-19>0 \end{array} \right.$$\Leftrightarrow \left\{ \begin{array}{l} x-8\geq 0\\ 2x-16>0 \end{array} \right.$$\Leftrightarrow \left\{ \begin{array}{l} x\geq 8\\ x>8 \end{array} \right.$$\Leftrightarrow x>8$
$a/\Leftrightarrow \left\{ \begin{array}{l} 3x-1-2x-7\geq 0\\ 4x+3-2x-19>0 \end{array} \right.$$\Leftrightarrow \left\{ \begin{array}{l} x-8\geq 0\\ 2x-16>0 \end{array} \right.$$\Leftrightarrow \left\{ \begin{array}{l} x\geq 8\\ x>8 \end{array} \right.$$\Leftrightarrow x\geq8$
$a/\Leftrightarrow \left\{ \begin{array}{l} 3x-1-2x-7\geq 0\\ 4x+3-2x-19>0 \end{array} \right.$$\Leftrightarrow \left\{ \begin{array}{l} x-8\geq 0\\ 2x-16>0 \end{array} \right.$$\Leftrightarrow \left\{ \begin{array}{l} x\geq 8\\ x>8 \end{array} \right.$$\Leftrightarrow x
&g
t;8$