$y-3xy+3y^2+y$
$4x+16xy+16y$
$4n^4.2n^{-3}$
$6xy^2+12xy+7xz$
$\left(4r^2s\right)^2\left(-2s^2\right)^2$
$\:-5\:+\:4\:-\:3$
$\left(t^{12}\:\right)^9$
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