Solve DX / (x + T) = dy / (- y + T) = DT

∵dx/(x+t)=dy/(-y+t)=dt==>dx/(x+t)=dt,dy/(-y+t)=dt==>dx-xdt=tdt,dy+ydt=tdt==>e^(-t)dx-xe^(-t)dt=te^(-t)dt,e^tdy+ye^tdt=te^tdt==>d(xe^(-t))=d(-(t+1)e^(-t)),d(ye^t)=d((t-1)e^t) ==>xe^(-t)=C1-(t+1)e^(-t)...

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