book Maths Puzzle Numerical Ability

solve for w in the equation A=lw

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Solve.

(x/x-9) - 4 = (9/x-9)

thanks Determine whether T: R�2→R�2 is a linear operator
1. T(x, y)=(2x+y, x-y)
2. T(x, y)=(x+1, y)
3. T(x, y)=( y, y)
4. T(x, y)=(x1/3, y1/3)

Thank you very much