$\frac{2x+8}{x-2}=-1$
$5z^3-18z^3+7z^3$
$x^4-7x^3+5x^2+31x-30$
$2x+11+6x$
$\int_0^{\infty}\left(x^2+18\right)dx$
$-739-475$
$-2y-y$
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