$-1720+-8930$
$4x^2+9\ge0$
$-4y+15\:=\:19$
$\frac{x^4+2x^3+x^2-1}{x^2+3}$
$25a^{12}-81a^2b^4c^6$
$2y-x+xy=2$
$m^2-4m^2+5m^3-7m+n^2-4m^2+n$
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