step 1. [(3 - (3 + h))/(3(3+h))]/h(adsbygoogle = window.adsbygoogle || []).push({});

step 2. -h/(3(3+h)h

My book says that those steps are valid. I don't see how.

If you want my opinion, I times the numerator (3 - (3 + h))/(3(3+h)) by the inverse of the denominator h/1 which makes:

step 2. -h/(9+3h) * h

step 3. -h/(9+3)

step 4. -h/12

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# Complex fractions

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