$$[ ( \frac { 1 } { 4 } ) ^ { - 1 } - ( \frac { 1 } { 5 } ) ^ { - 1 } ] + 1$$
$0$
$$4-\left(\frac{1}{5}\right)^{-1}+1$$
$$4-5+1$$
$$-1+1$$
$$0$$
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