左边= x+(1/2 -1) = x - 1/2 = x - 0.5右边=2+2/4 - x/4 = 2+0.5 - x/4 = 2.5 -0.25x左边= 右边x-0.5 = 2.5 - 0.25xx+0.25x = 2.5 + 0.51.25x = 3x=2.4