$4\left(-5+2\right)+\left(-6\right)$
$\frac{7x^2}{2}-2x$
$7x-2y-10x+5+8y$
$\frac{dy}{dx}=xy-2y+x-2$
$x^2-x-1\le0$
$49x^4+y^2+14x^2y+1$
$8x^2-2x+14-5x-2+15x^2$
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