16. Simplify: -a -[a + {a + b -2a -(a-
2b)}- b] *
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Step-by-step explanation:
= -a -[a + {a + b -2a -(a-2b)}- b]
= -a -[a + {a + b -2a - a +2b}- b]
= -a -[a + {3b-2a}- b]
= -a -[a + 3b - 2a - b]
= -a -[2b - a]
= -a - 2b +a
= 2b
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