1]
[tex]1-2x=4x-1\\\\-2x-4x=-1-1\\\\-6x=-2 \ \ |:(-6)\\\\x=\frac{1}{3}[/tex]
2]
[tex]3x-1=1-2x\\\\3x+2x=1+1\\\\5x=2 \ \ |:5\\\\x=\frac{2}{5}[/tex]