$2\left(y-9\right)+2y-4$
$\frac{1}{2}\left(x^2+2x+1\right)-4x-4-3-\frac{1}{2}x^2+4x+3$
$-e^y=xe^x-e^x$
$\int x^2e^{-x^3}dx$
$\left(4x^2y-z^2\right)^3$
$\int\frac{x-2}{x^3-3x^2}dx$
$r+\left(-5r\right)$
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