$2x-3\le3x+7$
$\frac{25}{49}m^2z^2-\frac{1}{9}m^4z^4$
$c^2+5c-25$
$10m^2+23m+6$
$-o.25x-2-45$
$28x^2y^2-63x^4y$
$m^4-15m^2+56$
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