exam Maths Puzzle Numerical Ability

can i please get help to subtract in simplest form?
5x/x-10
minus
50/x-10

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exam Other Question

An author earns $1.15 for every book sold. How many books must be sold if the author wants to earn at least $46,000.
x.1.15=46,000= 4000 How do I put this in an equation Thanks for your help Algebraically determine the exact roots in simplest form for:
(6sqrt2+2x)/(sqrt8/ = (sqrt8x) / (6sqrt2-2x