2(2x - 3) + 1 = 5(x + a)
把 x = 0 代入得:
2×(-3) + 1 = 5a
5a = -5
a = -1
(2x - 3)/5 + 1 = (x - 1)/2
2(2x - 3) + 10 = 5(x -1)
4x - 6 + 10 = 5x - 5
x = -6 + 10 + 5
x = 9