10-{4a-(7-a+5)-(5a-1-a)
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10-{4a-7+a-5-5a+1+a}
10-4a+7-a+5+5a-1-a
10+7+5-1=4a+a-5a+a
21=4a+a-4a
21=a
therefore, the value of a is 21
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