$18x\left(-9\right)-1$
$x^5\:+\:3x^4-4x^2$
$-1-5+3x-1$
$2x^2-4x-6x^2$
$\left(4d-1\right)\left(3d+3\right)$
$amalgama$
$2\int\frac{e^{-2x}}{e^{-x}+1}dx$
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