$$M-N/2M+3M-1/5M$$
$\frac{M\left(38-5N\right)}{10}$
$$\frac{10M-5NM+30M-2M}{10}$$
$$M\left(38-5N\right)$$
$$-5N+38$$
$$\frac{M\left(-5N+38\right)}{10}$$
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$-\frac{MN}{2}+\frac{19M}{5}$