Input:
dsolve(x(1,t)=x-t,y(1,t)=t-x)
Write:
`dsolve(x(1,t)=x-t,y(1,t)=t-x)`
Output:
$$dsolve(x^{(1)}(t)=x - t,y^{(1)}(t)=t - x)== x=1+C_1\ exp(t)+t, y=C_1-C_1\ exp(t)-t$$
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