One switch - red series dimmer

I have a one switch setup, where the box has 3 pairs of black and white coming into it. All 3 white are connected, and 2 black wires go to the bottom of the old switch, one to the top (has a blue piece of tape on it. Would that be the line?

Nm, figured out the two blacks were line, carrying to another room. Black with blue tape was the load.

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