$-56:-7$
$-7m-8m-9m$
$4y^a-\:6x^b\left(4y^a+6x^b\right)$
$sin\left(2t-1\right)$
$2x+3<3x+7$
$\frac{y'}{x}=-y$
$100m^3n^4p^3-25mn^3p^5$
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