Input:
dsolve(ds(y,x,-2)-2y=exp(x))
Write:
`dsolve(ds(y,x,-2)-2y=exp(x))`
Output:
$$dsolve(\int \int y\ (dx)^{2.0} - 2\ y=exp(x))== -exp(x)+C_1\ (E_{-2} (2\ \frac{1}{x^2}))$$
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