[(4x-5)×1/2-1/2]×1+1=1
[(4x-5)×1/1×1/2]×1+1=1
(4x-5/1×1/2)×1+1=1
4x-5/2+2/2=1
4x-5+2/2=1
4x-3/2=1
4x-3=1×2
4x-3=2+3
4x=5
=>x=5/4=0,8....