$\sin\left(x+270\right)$
$22.8+\left(-2.9\right)$
$-5u^2-13u+6$
$171-1-2$
$\left(\frac{1}{4}\right)^{-3}$
$\left(-24\right)+\left(-8\right)-\left(-6\right)$
$3\sqrt{6}-15\sqrt{6}+8\sqrt{6}$
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