exam Maths Puzzle Numerical Ability

Solve.

3/x = 7/x - 1/3

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exam Other Question

f(x)=2x^2-x+7 ; g(x)=x-1

find (f-g)(x)

I don't know if I am to just subtract or put in the proper way. I am lost. 87+92+K(all divided by 3)=91 Thanks