exam Maths Puzzle Numerical Ability

help me with this problem: 7/x^2-3x - 3/x = 5/3-x

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exam Other Question

The diagnol of the rectangle is 15 cm. Permimeter is 38cm. What is the area?
Is it possible to find the answer without finding out the dimensions of the rectangle? in interval notation, what is the range of

K(X)=9X square -81?