$\left(-4\right)x\left(+6\right)x\left(-7\right)x\left(+8\right)$
$5x-8;x=\:-1$
$\frac{x^{13}}{x^{-9}}$
$912+334$
$\int\frac{13x-8}{13x^2-16x+5}dx$
$-2x^3+x^2+2x-1$
$x^4+18+81$
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