$54y^3-25y^3+48l^2y+81y^3-87l^2y$
$\log xa2+\log xb3$
$\lim_{t\to0}\left(1-e^t\right)^{t^2}$
$( a - b x ) ( a + b x )$
$-271+945$
$27z^9+64z^{15}$
$-3x^2-5x$
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