$-287-212$
$32-\left(3+4\right)^2$
$+1+0-1+0+0+1+1+1+1$
$-600\:+20$
$\sqrt{0.0144c^{20}}$
$\left(-5x\right)\cdot\left(3x-2\right)$
$5a^4-10a+15a^3+20a^2$
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