$21+9b-4b$
$3x^5-2x^4-8x^2$
$\int\frac{2x^2}{x+4}dx$
$x+6=3x+22$
$-14-\left(-27\right)$
$\sqrt{2}\sqrt{4}$
$\left(\frac{2x^{-3}y^6}{x^2y^{-4}}\right)^2$
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