$$0.2m-0.02n+1.07m-1.03n-m-n$$
$\frac{27m}{100}-\frac{41n}{20}$
$$1.27m-0.02n-1.03n-m-n$$
$$1.27m-1.05n-m-n$$
$$0.27m-1.05n-n$$
$$0.27m-2.05n$$
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$0.27$