$15a^3-20a^2-5a^2$
$6-2a$
$\frac{3}{2}\ge x-2$
$\left|1\right|^2.-5-5$
$x+0+x$
$\frac{d^2}{dx^2}\left(-4\sin\left(x\right)\right)$
$\left(4m-7\right)\left(7+4m\right)$
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