$-2-\left(-12\right)$
$\left(-x+5\right)\left(x+1.8x\right)$
$\left(2x\:+\:1\right)\left(2x-5\right)$
$-27-45-32-28$
$\left(4c^4\right)\left(ac^3\right)\left(3a^5c\right)$
$\sqrt{5}\sin\left(x\right)+2=1$
$\frac{8^{-3}}{8}-\frac{8}{8^5}$
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