$2ab+3a-12a-15a+7ab-13a$
$7x+3+8x-1+4x-5+3x+2+2x+1$
$\frac{x^2-8x+6}{x-2}$
$\frac{x^3+1}{x^3-5x^2+6x}$
$5a+4b-7a-11b$
$x^2+8.x^2$
$\lim_{x\to\infty}\left(8xe^{-7x}\right)$
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