$24\cdot51$
$-77+-56-65-54+-8$
$15-3\left(2x+14\right)$
$\lim_{x\to0}\left(\frac{1+2\cos\left(x\right)-3e^{-x^2}}{2sin^2\left(x\right)}\right)$
$y^2-3y+1$
$m-3\le17$
$\left(y^2+7\right)\left(y^2-7\right)$
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