$\left(-11y^2+2y+3\right)-\left(-3x^2+3x-9\right)$
$2x^2-12x+10$
$\left(x-a\right)\left(x-b\right)^n$
$2x^2+3x-27=0$
$\frac{12xy}{3x^2}\\:x\\:\\:4y\\::\\:\frac{3y^2}{x}$
$\int\frac{x^2+2x}{x^2+1}dx$
$\int\frac{cose}{sen^2e}de$
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