$-x-1=-5$
$\left(-4x^4y^3\right)\left(5x^7y^2\right)$
$-2n=-28$
$\frac{y^2+2y-16}{y+5}$
$\frac{1+a^3b^3}{1+8b}$
$\int\frac{1}{x^2+x-1}dx$
$4\sqrt{-81}$
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