please solve this problem immediately step by step
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a-{3a-(2a-5)/10}-(2a-57)/6
=a-3a-2a/10+5/10-2a/6+57/6
=a-3a-a/5+1/2-a/3+57/6
=(30a-90a-6a+15-10a+285)/30
=(-76a+300)/30
=-38a/15+10
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