-a-[a +(a+b-2a-(a - 2b}-b]
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Step-by-step explanation:
solve:.-a-[a+(a+b-2a-(a-2b)-b)]
=-a-[a+(a+b-2a-a+2b-b)]
=-a-[a+(a+b-3a+b)]
=-a-[a+(-2a+2b)]
=-a-[a-2a+2b]
=-a-[-a+2b]
=-a+a-2b
= -2b ans
bracket sahi se lagaya karo
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