2а-(4а-(-а+(-3-(а-5)))=2а-(4а-(а+(-3-а+5)))=2а-(4а-(а-3-а+5))=2а-(4а-2)=2а-4а+2=2-2а=2(1-а)
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2а-(4а(-а+(а-5))))=2а-4а-а+3+а-5=-2а-2
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2а-(4а-(-а+(-3-(а-5)))=2а-(4а-(а+(-3-а+5)))=2а-(4а-(а-3-а+5))=2а-(4а-2)=2а-4а+2=2-2а=2(1-а)
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2а-(4а(-а+(а-5))))=2а-4а-а+3+а-5=-2а-2