exam Maths Puzzle Numerical Ability

Solve the following equation.

7/x - 1/x-3 = 9/x squared-3x

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exam Other Question

the square root of 8 + the square root of 32 - the square root of 50. Tom is building a rectangular dog pen that we wants to enclose. The width of the pen is 2 yards less than the length. If the area of dog pen is 15 square yards, hpw many yards of fence would he need to completely enclose the pen? Please and thank you :)