Input:
pdsolve(ds(y,t)=ds(y)-2y)
Write:
`pdsolve(ds(y,t)=ds(y)-2y)`
Output:
$$pdsolve(\frac{dy}{dt} =\frac{dy}{dx} - 2\ y)== C_1\ exp((-2)\ t)+C_1\ exp(2\ x)$$
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