exam Maths Puzzle Numerical Ability

34=-48-m

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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 a^2-a-6/a^2-9*a^2+7a+12/a^2+4a+4