1) x-3/4:(3/8-1/6)=6
x-3/4:(9/24-4/24)=6
x-3/4:5/24=6
x-3/4=6*5/24
x-3/4=5/4
x=5/4+3/4
x=8/4=2
2) x-7/15:(3/4-1/2)=-4
x-7/15:(3/4-2/4)=-4
x-7/15:1/4=-4
x-7/15=-4*1/4
x-7/15=-1
x=-1+7/15 -1+7/15=-15/15+7/15=-8/15
x=-8/15
3) 2/5+x:(2/3-1/6)=-2
x:(4/6-1/6)=-2-2/5
x:3/6=-2 2/5
x=-2 2/5*3/6 -2 2/5*3/6=-12/5*1/2=-6/5=-1 1/5
x=-1 1/5