(x - 1)/4 = (2 - x) - 5
两边同时乘以4得:
x - 1 = 4(2 - x) - 20
x - 1 = 8 - 4x - 20
x + 4x = 8 - 20 + 1
5x = -11
x = -11÷5
x = -2.2