3x-4=0 x=? =[3x]-4=0 =0-4=[3x] = 3x=[-4] = [-4]÷3=x = x=[-3/4]
2x-5+4x-9=12 12=9-4x+5-2x 12-9 =3 3=4x+5-2x 3=4x+5-2x 3=2x+5 [-2]=2x x=[-1]
