exam Maths Puzzle Numerical Ability

solve 4/x+ 2 - 1/6x = 2/6x^2 + 12x I got 1/6

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exam Other Question

Solve the equation:

sqrtx+4 = 3

I tried to keep this seperated because the square root is x + 4.

I am going to assume I need to make X equal the 3 leaving me with this:
X= -1
sqrt-1+4 = 3
Is this the right process? The two companies with top revenues in the Fortune 500 list for 2005 were Exxon Mobil and WlMart. Their revenues together totaled $656 billion. Wal-Mart revenues were $24 billion less than Exxon Mobil revenues. What were the revenues of each corporation?