4(х-1/2)=0, ( х -1 целая 3/4)*2/3=0, 12 (х -1 целая 3/10*5/6)=0 ! !

4(х-1/2)=0,
4x-2=0
4x=2
x=2/4=1/2

( х -1 3/4)*2/3=0
2/3x-7/6=0
2/3x=7/6
x=7/6×3/2=7/4=1 3/4

12 (х -1 3/10*5/6)=0
1 3/10×5/6=13/10×5/6=13/12
12x-13=0
12x=13
x=13/12=1 1/12