$$78-58+40-7 \times 5+20 \times 1$$
$45$
$$20+40-7\times 5+20\times 1$$
$$60-7\times 5+20\times 1$$
$$60-35+20\times 1$$
$$25+20\times 1$$
$$25+20$$
$$45$$
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$3^{2}\times 5$
