exam Maths Puzzle Numerical Ability

How can I Subtract and Express the answer in simplest form.

2/5-y/y-2

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exam Other Question

please

if f(2x)=4/2+x

compute

f(x)=? "If 5 to the 21st power * 4 to the 11th power = 2 * 10 to the nth power, what is the value of n?"

With a calculator, the answer is 21. However, I would appreciate knowing how to solve this problem without a calculator. Thank you.