$49m^2-25$
$\lim_{t\to-4}\left(\frac{t^{2}-16}{3t^{2}+20t+32}\right)$
$x^2+8a^2+5x^2+5a^2$
$20x^2-125$
$\frac { x ^ { 4 } - 4 x ^ { 2 } + 6 } { x + 2 }$
$y^2+3y+9\:\cdot\:y-3$
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