$-1-5+3x-1$
$767-148$
$\lim_{t\to\infty}\left(t.e^{-t}\right)$
$\left(5x\:^2-7\right)\left(5x\:^2+7\right)$
$a^3\cdot a$
$\left(bc+1\right)\left(bc-1\right)$
$ab+5ab^2$
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