How can I use this LED strip light with 2 negative wires and 1 positiv

How can I use this LED strip light with 2 negative wires and 1 positiv

I bought this LED strip wire for my tail light, usually the connection is 1(+) for tail, 1(+) for brake, and 1(-) for ground, but this LED strip had caused me headache switching the wires, results are confusing but both red(brake) and orange(tail) lights should work separately.