A-(a-(a+(a-1))) решите и упростите

Question

A-(a-(a+(a-1))) решите и упростите

Answer 1

A - ( a - ( a+ a - 1)) = a - ( a - ( 2a - 1)) = a - ( a - 2a + 1) = a - ( - a + 1) =
= a + a - 1 = 2a - 1