a) 3x+2-1=0=> 3x+1=0=>3x=1=>x=1/3
b)3* (-4)+2m-1=0=>-12+2m-1=0=>-13+2m=0=>2m=13=>m=13/2
c)pt.x=1: 3+2m-1=0=> 2+2m=0=> 2m=2=>m=-1
pt. x=2: 3*2+2m-1=0=>6+2m-1=0=>5+2m=0=>m=-5/2
pt. x=3: 3*3+2m-1=0 => 9-1+2m=0 =>8+2m=0 => m=-4
pt x=4: 3*4+2m-1=0 =>12-1+2m=0 => m=-11/2