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## Homework Statement

I'm currently working on a problem that requires me to set the derivative = 0 and solve for a variable (call it x). The derivative comes out to be a fraction, with x terms in both the numerator and denominator. Is it legal to just multiply 0 by the denominator (thereby canceling it) even if it has the term of interest as part of it?

Simple Ex: say the derivative came out to be x-3 / 2x. And I want to solve for x.

When I set that derivative equal to zero, can i just multiply 0 by 2x, leaving x-3=0? So x=3

## Homework Equations

none

## The Attempt at a Solution

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