-a-[a+(a+b-2a-(a-2b)]-b]
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Answer:
2b
Step-by-step explanation:
–a–[a+{a+b–2a–(a–2b)}–b]
–a–[a+{a+b–2a–a–2b}–b]
–a–[a+{a–2a–a+b–2b}–b]
–a–[a+{–2a–b}–b]
–a–[a–2a–b–b]
–a–[–a–2b]
–a+a+2b
2b
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