$x^2\:+\:4x\:-\:20$
$x^5+4x^3y^2+3y^2=8$
$8-\left(-5-3\cdot4+5\left(8-\left(6-1\right)\cdot3+\left(2-5\right)\cdot4\right)\right)$
$\frac{9a^2b^2-16a^2b^6}{3a^2b-4ab^3}$
$\frac{d^4y}{dx^4}+\frac{2d^2y}{dx^2}+y=0$
$4a^3+bx-4bx$
$\lim_{x\to-2}\:\:x^2-4$
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