$\left(2y\:+\:3\right)\:\left(-3\:-\:2y\right)$
$x-20<50$
$x\cdot\left(-12\right)=84$
$\int\left(3x+1\right)^{10}dx$
$\lim_{x\to0}\left(\frac{x-\sin\left(x\right)}{\cos\left(x\right)+x^2+1}\right)$
$7n^2+n^2$
$\left(-14\right)+4$
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