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When the sink in the bathroom drains, the bathtub fills up with mucky black water. Then it slowly drains out of the bath tub.
One thing you could try, is blocking the drain in the bathtub, putting some water in the sink, and vigorously plunging the sink drain. It may be that a good plunging will dislodge the clog. I used to use this technique when I blocked the drain with gunk from my garbarator, and the other side of the twin sink would fill with foul water. Cover one sink, and plunge in the other.
Appears you need a plumber to clear the drains completely, well beyond what you may be able to do now.
I agree with Dinah. The clog is further down the line, and you need a plumber to deal with it.