Express the Following as a Single Fraction Involving Positive Exponents $$- 4 x ^ { - 3 } - 5 x ^ { - 7 } + x$$

Multiple Choice

Express the following as a single fraction involving positive exponents only. $$- 4 x ^ { - 3 } - 5 x ^ { - 7 } + x$$

A) $\frac { x ^ { 6 } - 4 x ^ { 4 } - 5 } { x ^ { 7 } }$
B) $- \frac { x } { 4 x ^ { 7 } + 5 x ^ { 3 } }$
C) $\frac { 4 x ^ { 4 } + 5 } { x ^ { 6 } }$
D) $x ^ { 6 } - 4 x ^ { 7 } - 5 x ^ { 3 }$
E) $- \frac { 1 } { x ^ { 10 } }$