giúp mk với ạ!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Câu 6:

a) `x-3/4=1/2`

    `x=1/2+3/4`

    `x=2/4+3/4`

    `x=5/4`

Vậy `x=5/4`

b) `-3/4-x=-7/12`

             `x=-3/4-(-7/12)`

             `x=-3/4+7/12`

             `x=-9/12+7/12`

             `x=-2/12=-1/6`

Vậy `x=-1/6`

c) `x+(-3)/4=-11/3`

    `x-3/4=-11/3`

    `x=-11/3+3/4`

    `x=-44/12+9/12`

    `x=-35/12`

Vậy `x=-35/12`

d) `-5/6-x=7/12+(-1)/3`

    `-5/6-x=7/12-1/3`

    `-5/6-x=7/12-4/12`

    `-5/6-x=3/12`

    `-5/6-x=1/4`

             `x=-5/6-1/4`

             `x=-10/12-3/12`

             `x=-13/12`

Vậy `x = -13/12`