$4x-1\:x-3x-7$
$x^2+16x=91$
$y=\left(1+ce^{-x}\right)^{-1}$
$x ^ { 2 } y ^ { \prime } = 9 x ^ { 2 } - 6$
$7x-91=0$
$\lim_{x\to1}\left(\frac{x^5+x-2}{x^2-1}\right)$
$-3518-3$
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