$$( - \frac { 4 } { 7 } ) ^ { 3 } \times ( - \frac { 4 } { 7 } ) ^ { 4 }$$
$-\frac{16384}{823543}\approx -0.019894529$
$$\left(-\frac{4}{7}\right)^{7}$$
$$-\frac{16384}{823543}$$
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$-\frac{16384}{823543} = -0.01989452888313057$
