$216\cdot\frac{1}{4}$
$100x^2-75=0$
$\int x^3\sqrt{x^2+29}dx$
$\lim_{x\to-1}\:-2x+1$
$3 n + 2 ( - 2 n - 1 )$
$-2u\left(3u^2-3u-1\right)$
$-5\cdot2+11$
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