1-[1 – {1 – (1-1-a)}].
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1– [1 – {1 –(1-1-a)}]
→ 1– [1 – {1–(0-a)}]
→ 1–[1– {1–(-a)}]
→1–[1– {1 + a}]
→1–[1–1–a]
→1–[0–a]
→1–[–a]
→1 + a
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