$21-\left(-3\right)$
$9xy^3-729x^3y$
$4\left(3+2\right)-4\left(4-10\right)$
$\int\left(-x-8\right)^9dx$
$\lim_{x\to0}\left(\frac{1\left(1-x\right)^{\frac{1}{4}}}{x}\right)$
$x+5=3x-1$
$x^2+6x+87$
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