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Visualise a straight line, which goes through the inner mounting and the centre of the spring plate/trailing arm bolts. This is the axis that you are rotating the arm about... The hub axis goes from the end of this line out at an angle.
So, if you rotate the arm, as the hub axis is not on the same axis as the rotating axis, the end of it will go up or down, giving camber change.
Does that make sense?
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