2 2 (y-2013) + (y-2010) = 4035 (y-2013) (y-2010) =?

Let y-2013 = t, then y-2010 = t + 3
(y-2013)^2+(y-2010)^2=t^2+(t+3)^2=4035,
——》2t^2+6t+9=4035,
——》t^2+3t=2013
——》(y-2013)(y-2010)=t(t+3)=t^2+3t=2013.

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