$4x^2+6x+9=0$
$\frac{2a^2+2b}{2}$
$\int_0^1\:\frac{x}{x^2\:-\:4}dx$
$-3x-\left(-2\left(x-3y\right)-4\left(-3x-2y\right)\right)$
$-3.5+3.5$
$xy^2+x^2y^4z+zx^2y^3$
$\frac{2x-4}{x-3}=3+\frac{2}{x-3}$
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