Delta-hedge a two-leg option book

Your book holds 20 long put contracts (delta −0.30 each) and 50 short call contracts (delta +0.45 each). Every option contract is on 100 shares. To delta-hedge, do you buy or sell shares, and how many? (give the signed share count: positive = buy, negative = sell)

Show hints (2)+
  1. Book delta = Σ (contracts × option delta × 100), with short legs flipping sign.
  2. Hedge = −(book delta); positive means buy shares.

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