Simplify the given expression. Assume that all variables represent positive numbers. Present your answer using positive exponents only.
(
a
−
3
b
−
7
−
a
4
b
3
)
0
=
\displaystyle {\left(\frac{{{a}^{{-{{3}}}}{b}^{{-{{7}}}}}}{{-{a}^{{4}}{b}^{{3}}}}\right)}^{{0}}=
(
−
a
4
b
3
a
−
3
b
−
7
)
0
=
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Enter your answer as an expression. Example: 3x^2+1, x/5, (a+b)/c
Be sure your variables match those in the question