$$3 \times 1/(4+2)-4 \times 2+1$$
$-\frac{13}{2}=-6.5$
$$\frac{3}{4+2}-4\times 2+1$$
$$\frac{3}{6}-4\times 2+1$$
$$\frac{1}{2}-4\times 2+1$$
$$\frac{1}{2}-8+1$$
$$\frac{1}{2}-\frac{16}{2}+1$$
$$\frac{1-16}{2}+1$$
$$-\frac{15}{2}+1$$
$$-\frac{15}{2}+\frac{2}{2}$$
$$\frac{-15+2}{2}$$
$$-\frac{13}{2}$$
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$-\frac{13}{2} = -6\frac{1}{2} = -6.5$
