$11y-9y+8y$
$\frac{d^4}{dx^4}\left(x^4-4x^2\right)$
$x+2=2x-2$
$\frac{d}{dx}x^2y-xy=10$
$2x+3y=11$
$-55\cdot2$
$f\left(x\right)=ln\left(\frac{1}{1-x}\right)$
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