Question: Rewrite expression

B12 := -6*(p1 + p2)/(p1 - p2)^2;
F2 := (theta1*theta2*p1^2 + (-2*p2*theta1*theta2 - 6)*p1 + theta1*theta2*p2^2 - 6*p2)/(p1 - p2)^2;

to..

F2 := theta1*theta2 + (-6*p1 - 6*p2)/(p1 - p2)^2
F2:= theta1*theta2 + B12  ( how to get this ?)

Should be very easy, but it is not 

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