book Maths Puzzle Numerical Ability

Hi there,

I don't get this problem with extraneous solutions! Could someone please help me work out this problem before class?
x-3/5 = x-3/x

Thank you
AC

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book Other Question

The width of a rectangle is 4 feet less than the length. The area is 320ft^2. Find the width of the rectangle.
___feet
Thank you
i need help with these problems as well please.

10 divided by w-8 subtracted from 12 over 8-w the answer i got was 22 divided by w-8????