$4x^4+9x^3-5x^2+9x-9$
$2\left(x+2a\right)\left(x+2\right)$
$\left(2x+2y+27\right)^2$
$\left(14y^3+3n\right)^3$
$3m\:+\:n\:-\:4m\:+\:n\:+\:m\:-\:2n$
$x2+10x+21$
$4x^2+20x+3$
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