$+20+10+0-10-20-30$
$\left(x^2+7\right)\left(x^2+3\right)$
$sin\left(x-50\right)=0.781$
$\tan\left(a\right)=0$
$\sqrt[3]{81b^7}$
$\frac{456}{-12}$
$x-2>5$
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