I am given the four-vector of two events in a reference frame S and I found that they are spacelike. I want to then find the reference frame in which these two events are simultaneous. I am still a bit confused about how this is even possible. There is that equation: gamma * delta t' = delta t where t is the time interval in the original reference frame and t' is the coordinate system in the new reference frame. If the delta t' is 0, how is this equations even solvable?