book Maths Puzzle Numerical Ability

3x^4=48x^2

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can someone please simplfy this for me, i dont understand the solver, thank you so much..
(5x^3+8x^2-4x)+(3x^2+7x+1) how many liters of a face cream that cost $3360 per liter must be mixed with 12 liters of face cream that cost $1120 per liter to make a face cream that cost $1680 per liter?