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Answer:
Hmmmm. Mr. McGill seems a little lost.
At first, I thought he might have divided both sides by 21 (to get 2x on the left), but look what happens on the right side of the equation!
[tex]42x=163\\\\2x=54\,\, 1/3[/tex] (not 3, for sure)
I think Mr. McGill needs to take the class you're in!