$$\{ ( \frac { 3 } { 4 } ) ^ { - 1 } - ( \frac { 1 } { 4 } ) ^ { - 1 } \} ^ { - 1 } = ?$$
$-\frac{3}{8}=-0.375$
$$\left(\frac{4}{3}-\left(\frac{1}{4}\right)^{-1}\right)^{-1}$$
$$\left(\frac{4}{3}-4\right)^{-1}$$
$$\left(-\frac{8}{3}\right)^{-1}$$
$$-\frac{3}{8}$$
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$-\frac{3}{8} = -0.375$
