Input:
pdsolve(ds(y,t)=ds(y)*x--ds(y))
Write:
`pdsolve(ds(y,t)=ds(y)*x--ds(y))`
Output:
$$pdsolve(\frac{dy}{dt} =\frac{dy}{dx}\ x+\frac{dy}{dx})== C_1+C_2\ (-log(-1-x)-t)$$
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