Question

11 - {3 + x - (2x - 1)} = 3 + (x - 3) + x

Answer 1

11-.(3+x-2x+1)=3+x-3+x
11-4+x=2x
7=x

Answer 2

11 - {3 + x - 2x+1} = 3 + x - 3 + x
11 - { - x +4 } = 2x
11 + x - 4 = 2x
7 + x = 2x
7 = x