exam Maths Puzzle Numerical Ability

SOME PANAMA HATS BOUGHT IN COLOMBIA COST 24$ EACH,OTHERS COST 12$ EACH,
IF 18 HATS OF THESE TWO GRADES COST 336$,HOW MANY HATS OF EACH KIND WERE BOUGHT

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exam Other Question

subtract the following:

x^2+2x/3x - x^2+5x+6/3x


I came up with x^4+5x+6/3x...is that right?

I need step by step if my answer is wrong. Thank you so much for all your help.
34=-48-m