Input:
dsolve(ds(y,x,pi)-y-2exp(x))
Write:
`dsolve(ds(y,x,pi)-y-2exp(x))`
Output:
$$dsolve(\frac{d^{{pi}}y}{dx^{{pi}}} - y - 2\ exp(x))== dsolve(2\ exp(x)+y,y,x,\pi )$$
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