$\int\left(x^3\cdot\arctan\left(x^4\right)\right)dx$
$2\left(x+y\right)+\left(y+x\right)=310$
$5\left(x-8\right)^2$
$2x+y-z=20$
$\lim_{x\to0}\left(\frac{1}{x}\right)\cdot\lim\:_{x\to\:0}\left(\frac{\sin\left(x\right)}{x}\right)$
$11d+5f-21d+5-8$
$s^2-26s+26$
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