What is the difference of the polynomials (12x2-11y2-13x)-(5x2-14y2-9x)
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(12x^2 -11y^2 -13x) - (5x^2 -14y^2 - 9x)
= 12x^2 -11y^2 -13x - 5x^2 +14y^2+9x
= 7x^2 +3y^2 - 4x
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