$80+20+51$
$y=4\left[x-\left(4-x\right)\right]-7\left(x+1\right)$
$\frac{d}{dx}\left(\frac{3x-2}{x}\right)$
$-9a^2-12ab-b^2$
$8ab^3+14a^2b-7ab^3-12a^2b$
$f\left(x\right)=\left(cosx\pi\right)^2$
$3x^2-18x+19$
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