$75x^4y-30x^3y+3x^2y$
$\frac{x^2-9y^2}{3x+9y}$
$43.95-21.19$
$\int\:x\:e^{18x}\:dx$
$\frac{x^3+x^2+x+6}{x^2+1}$
$\lim_{x\to4}\left(\sqrt[x]{5x+7}\right)$
$\left(4p-2q+5\right)\left(p+4q\right)$
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