exam Maths Puzzle Numerical Ability

I need help solving the proportion X/X^2+4=7/5x. please and thank you

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Subtract the complex numbers: (3 + 5i) - (1-7i). A cow is tied by a 25m rope to the corner of a barn as shown. A fence keeps the cow out of the garden. Find, to the nearest square meter, the grazing area. Use SQR(2) = 1.414