$$( 12 \quad ( c ) ( \frac { \frac { 1 } { 5 } } { 3 \frac { 4 } { 5 } } \times 19 ) \div 5$$
$\frac{12c}{5}$
$$\frac{12c\times \frac{5}{5\left(3\times 5+4\right)}\times 19}{5}$$
$$\frac{12c\times \frac{5}{5\left(15+4\right)}\times 19}{5}$$
$$\frac{12c\times \frac{5}{5\times 19}\times 19}{5}$$
$$\frac{12c\times \frac{5}{95}\times 19}{5}$$
$$\frac{12c\times \frac{1}{19}\times 19}{5}$$
$$\frac{\frac{12}{19}c\times 19}{5}$$
$$\frac{12c}{5}$$
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