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How far does that crack go in the basement? Is the footing cracked on both ends along with that crack on the floor? It looks to be awfully thin but it may just be the shadow from the photo. If its just the slab, then it should be fairly cheap to repair but you must dig deeper and find the cause of the problem so it does happen again. Are there splits on the walls along neither ends of that crack?
How long and tall is that retaining wall? That will cost a few bucks but you must get engineering done on it. Tim is correct, its really difficult to see from just a few pics without being there in person to look at other telltale signs. How about a few more non close up pics. Is that basement crack the only crack in the house? How about the footing or other parts of the foundation? If that's the only crack and there are no other cracks on the footing, then I say you maybe in luck.
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