6x=4/7
x=4/7÷6
x=2/21
3/4x*1/4=5/6
3/4x=10/3
x=40/9
1/8x+1/2=2/3
1/8x=1/6
x=4/3
3x+5=2x+10
3x-2x=10-5
x=5