Срочно!!!! помогите пожалуйста (2a-1)(a+1)+(2a-1)(a-3)+2a-2/a-1

((2a - 1)(a + 1) + (2a - 1)(a - 3) )+2(a - 1) / (a - 1) =  = (2a - 1)(a + 1 + a - 3) + 2(a - 1) / (a - 1) = (2a - 1)(2a - 2) + 2(a - 1) / (a - 1)= = 2(a - 1)(2a - 1) + 2(a - 1) / ( a - 1) = 2(a - 1)(2a - 1 + 1) / ( a - 1)= = 2(a - 1)*2a / ( a - 1) = 4a(a - 1) / (a - 1) = 4a