$\tan\left(x\right)=-\frac{5}{4}$
$\int\frac{3x^3+3x^2+3x-3}{x^2-1}dx$
$6x^2-54x+24=0$
$2x+3y=54$
$16x^2+8x-79=0$
$\frac{d}{dx}\left(\frac{1}{\left(x+6\right)\left(x+7\right)\left(x+2\right)}\right)$
$4x^2+2x-7=0$
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