$4x^2-\frac{14}{3}x^2$
$-4-15\cdot15$
$\int xc^{-3x}dx$
$2.5.\:2.5$
$4yx^2-4y^2x$
$\sin\left(30\right)+\sin\left(60\right)\cdot\sin\left(45\right)$
$4n+6+n-2$
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