Okay, yaar, let's break it down. Start from the right: you can't take 7 from 3, so you borrow, but hitting those zeros is tricky. You borrow from the 5, make the 0 a 10, then again until you can finally do 13 minus 7, 9 minus 6, 9 minus 8, and 4 minus 1... answer's 3136. Honestly, explaining this reminds me of my Dzire's rattling tyre — sometimes you go over the same step again and again, and it just *feels* fixed, but the worry stays.
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