If someone could explain the error in depth and show step by step how to actually slove the problem that would be great.

Step-by-step explanation:

The first step is wrong. It claims that

but it is not true. It is attempting to simplify the fraction by cancelling the x^3 terms from 9x^3 and 2x^3.

However, to perform this operation, all terms in the fraction must be divided by x^3. But this will mean

if the pizza is divided equally into 2 equal halves then you would get

πr^2/2

where r is the radius of the pizza.

happy to

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hope this !