Input:
dsolve(ds(y)*(x--y)-x--y-1=0)
Write:
`dsolve(ds(y)*(x--y)-x--y-1=0)`
Output:
$$dsolve(\frac{dy}{dx}\ (x+y) - x+y - 1=0)== -x-\frac{1}{2}\ {x}^{2}+x\ y+\frac{1}{2}\ {y}^{2}=C_1$$
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