$6x\cdot\left(2x-3\right)$
$x^'=y$
$9-\left\{6-\left[\left(-32\:-\:15\:+8\right)-22\:\right]-7\right\}$
$sin\left(x+t\right)-sin\left(x-y\right)$
$-2\left(1\:2\:-9\:-18\right)$
$16x^2-16x+4$
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