Question

10-{4a-(7-a+5)-(5a-1-a)​

Answer 1

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