exam Maths Puzzle Numerical Ability

1/X + X/3X+9 - 3/X^2+2X

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exam Other Question

I am having problems with this problem

Find the length X in the triangle:
express in simplified radical form:
one side is 12
and the other side is 8

thank you alot I am not that good at these. If the sum of a number and -3 is doubled the result is 1/2 times the number. Find the number.