$\left(+6bc\right)-\left(+2bc\right)$
$20x^2-20x+25$
$1-3p+2p-9$
$\lim_{x\to0}\left(\frac{e^{2x^2+x-1}-e^{x^2+x+1}}{x^2}\right)$
$9x^2+24x+16$
$4+2+6-12$
$\int\frac{2\left(1+x\right)}{27}dx$
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