book Maths Puzzle Numerical Ability

Could you please answer this question Half a number and nine is 15 can I please get the answer

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Hi there,

I don't get this problem with extraneous solutions at all! Could someone please help me work out this problem before class?
1+3y / y-2 = 6 / y-2

Thank you
AC
For f(x) = 3x - 5, find f(2).