Subtraction of Polynomials

(5x+1)-(3x+2)
(7x+9)-(4x-1)
(10-2x)-(-x+1)
[math]\left(-3x^2+9\right)-\left(2x-x^2\right)[/math]
[math]\left(x^2+5x+9\right)-\left(3x^2+4x+1\right)[/math]
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Information: Subtraction of Polynomials