7.4^13×9^8-8^9.4.3^10.9^3/5.6^19.2^9-27^6.7.16.2^25
=7.67108864-134217728.4.59649. 729/5.609359740010496.512-387420488.7.16.33554432
=469762048-14567139652100000000000000000000000000000000-791224463587944960
=-14567139652100000000000000791224
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