1.

-a -[a + {a + b -2a -(a -2b)} -b]

Answer»

ANSWER:

-2(a+B)

Step-by-step explanation:

-a-[a+{a+b-2a-a-2b}-b]=-a+[a+a+b-3a-2b-b]=-a-a-2b=-2a-2b=-2(a+b)

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