$6+9\cdot6$
$4x^2-2x+3$
$\left(8+b\right)\left(6+b\right)$
$\sqrt[4]{16x^{14}y^{18}}$
$9x^2-42xy+39y^2$
$2x^2\:-\:3xy\:=\:x\left(2x-\:3y\right)$
$\frac{dn}{dt}=1000-n\cdot0.5$
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