$\frac{dy}{dx}\left(x^2-1\right)y=-x$
$3\sqrt{27}$
$-9-\left(3.5\right)$
$2x+y=13$
$-10-[+5-\left(20-14\right)-7]-6+12+\left(-2$
$\left(1+sinx\right)\left(1-sinx\right)$
$x^2+40x+150$
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