$18-x<21x-26$
$\left(-x+3\right)\left(x^2-5x+6\right)$
$5a^2-2bc-3d;\:a=2;\:b=5;\:c=-3;\:d=-1$
$\left(2b+5\right)\left(2b+9\right)$
$\frac{d}{dx}4x^2+2x-1$
$\int\sqrt{25x^2+9}dx$
$\frac{28x^5}{14x^{-4}}$
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