How is u/u-7 simplified using only positive exponents? Using the quotient law wouldn't it be u1+7 = u8?

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter7: Applying Fractions
Section7.9: Negative Exponents
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How is u/u-simplified using only positive exponents?

Using the quotient law wouldn't it be u1+7 = u8?

 

 

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