a, \(\left(3x-1\right)\left(2x+7\right)-\left(2x+1\right)\left(6x-5\right)=16\)
\(\Leftrightarrow6x^2+19x-7-12x^2+4x+5=16\)
\(\Leftrightarrow-6x^2+23x-18=0\Leftrightarrow\left(2x-9\right)\left(3x+2\right)=0\Leftrightarrow x=\frac{9}{2};x=-\frac{3}{2}\)