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In theory, if you can find a tire shop that is willing to shave a brand new tire, you can shave the new tire down to 7/32 and put it on.
If you have the storage space, I'd say it's better to buy 2 tires, and keep the 7/32 good tire around. Generally speaking, by the time a tire wears down to ~5/32 thread depth, the tire's ability to expel water would start to degrade.
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