$-99.4+\left(-72.8\right)$
$2\left(-4r-4\right)-3r$
$18x^2-25=8x^2-16$
$\int7x^3\:e^{-4x}dx$
$4ab+\left(a-2b\right)^2-a^2-4b^2$
$2+3\left(\frac{8}{3}\left(9\right)\right)^2+-10-10$
$\frac{x^3-5x+2}{x^2+2x-1}$
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