sys:=diff(y(t),t)=x(t)+y(t)-z(t);
> sys:=diff(z(t),t)=2*x(t)-y(t);
> dsolve({sys},{x(t),y(t),z(t)});
10)
> sys:=diff(y(x),x)=y(x)+5*z(x);
> sys:=diff(z(x),x)=-y(x)-3*z(x);
> dsolve({sys},{y(x),z(x)});
11)
> sys:=diff(y(x),x)=((y(x)^2)-y(x)*z(x))/(x^2-y(x)*z(x));
>
> sys:=diff(z(x),x)=(z(x)*(x+y(x)))/(x^2-y(x)*z(x));
>
>
> dsolve({sys},{y(x),z(x)});
12)
>
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