$2x^2-4x-12=0$
$x=y^2+1$
$a^2+4^2+4ab-x^2-2ax-a^2$
$\int x\left(2x^3-6x+\frac{3}{x^2+1}\right)dx$
$6x-4>9x+15$
$\frac{dy}{dx}=\frac{y^2}{15x^3}$
$\frac{2\cdot6}{4}-30$
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