book Maths Puzzle Numerical Ability

i need help with this problem, 3/x^2+4x+3-1/x^2-9

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Kayla has 25 ounces of a 75% boric acid solution. How many ounces of 35% boric acid solution should she add to obtain a solution that is 60% boric acid? So far, I've come up with ______4______ + ____1______ = ______2_______
x^2-x-12 x^2-9 x^2-7x+12