1) 4x+3/4x=3+6
19/4x=9
x=36/19
2)2/3x-2/3=1/4x+1/2-1
2/3x-1/4x=2/3-1/2
(8-3)/12x=(4-3)/6
5/12x=1/6
x=2/5
3)1/2x-5/6x+2/3x=1+4/3+1/6
(3-5+4)/6x=(6+8+1)/6
x=15/2