$-15\:+\:-25\:+\:-35\:+-45\:+-55$
$3c+24$
$x:90.000<\:700.000$
$\left(4a^2+b\right)^2$
$4+7h+10h-1-7h$
$\frac{d}{dx}\left(x-y^2\right)$
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