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Negative exponents are defined in such a way that 10-7 = 1 / 107.
It does not work that way. A negative power is simply the reciprocal. So that x-a = 1/xa The reciprocal is negative or positive according to whether the number itself is negative or positive. [And, if the number is 0, the reciprocal is not defined.]
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For example, 10 to the power -5 means the same as 1 divided by (10 to the power 5). In general, you can interpret negative exponents this way, with reciprocals.
Use a calculator? The answer is 31, by the way. * * * * * and also negative 31.