$-3x^2y+12xy^2$
$\frac{x^4-3x+2}{x-3}$
$\left(3^2\right)^2\cdot3^2$
$\left(x^2+1\right)^2-\left(x-1\right)^2$
$m+3=0$
$144u^2-204u+42$
$12x=108$
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