$$\left. \begin{array} { l } { \frac { 3 ( a - 5 ) } { 4 } - 4 a = 3 - \frac { ( a - 3 ) } { 2 } } \end{array} \right.$$
$a=-3$
$$3\left(a-5\right)-16a=12-2\left(a-3\right)$$
$$3a-15-16a=12-2\left(a-3\right)$$
$$-13a-15=12-2\left(a-3\right)$$
$$-13a-15=12-2a+6$$
$$-13a-15=18-2a$$
$$-13a-15+2a=18$$
$$-11a-15=18$$
$$-11a=18+15$$
$$-11a=33$$
$$a=\frac{33}{-11}$$
$$a=-3$$
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