I know I'm getting into this late, and because the only info offered is the item dimension, saw can't handle it. So I'm assuming it's a portable or contractor TS and you did not offer the info on whether you have a router or circular saw as backups to solve the problem.
1. If you have a hand plane you could mark off the .2 from the item edge then plane it.
2. If you have a router chuck in any straight bit, clamp the opposite end of the item to your table or bench, set the router on the edge of the item, rotate the bit till the cutting edge pulls the router away from the item. Without disturbing the router slide a reliable T, framing, combo or machinist square up to the router base and mark it. Determine the distance from the item edge to the mark then add the .2. Accurately mark the (X.2) distance at both corners then clamp a reliable straight edge to the correct side of the marks. Route the item edge.
3. The same procedure will work with a circular saw, just remember to set the circ blade all the way down to get the widest possible space between its cutting edges.
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