$3\left(-2\right)^2-8x+4$
$\frac{25b^7}{25b^3}$
$\left(0.6+2x\right)^2$
$\lim_{x\to-2}\left(\sqrt{\frac{3x^2-2x}{2}}\right)$
$\frac{a^{2\:}+4a\:+\:4}{a^2\:+\:7a\:+\:12}$
$\frac{x^4}{-4}+4x^2-16$
$x^2-2x-15=22$
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