exam Maths Puzzle Numerical Ability

What would a x value, that is undefined, be for the equation y=2/(1-2x)?

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exam Other Question

Please help to solve the following problem:

Either perform the indicated operation or solve the equation whichever is appropriate:

x^2-4/x divided by 4x-8/x

Thank you very much. y=f(x-1)solution and graph.