$\left(-21\right)-\left(-23\right)$
$ab+4ab$
$2\left(2mn^2\right)\left(3m^{-1}n^{-3}\right)$
$3y^2dy-x^2dx=0$
$3a^2b+6ab^2-a^2+2ab$
$6x-7x^2+x^3$
$x-3>8$
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