$\lim_{x\to-\infty}2x^3+3x-1$
$7t-15u-6t+4u-3t$
$senx+cosx=0.5$
$81m^2-121n^2$
$\left(a^2+3-a\right)\:\left(a^2+3-a\right)$
$\frac{1}{15}.\frac{15}{1}$
$4x^2-4x-4$
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