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1) `1/3-x=3/5`

=>`x=1/3-3/5`

=>`x=-4/15`

 Vậy `x=-4/15`

2) `5/4 : x=-3/5`

=> `x = 5/4 : (-3/5)`

=> `x= -25/12`

Vậy `x=-25/12`

3) `5x+1/2=2/3`

=>`5x=2/3-1/2`

=>`5x=1/6`

=>`x=1/6 : 5`

=>`x=1/30`

Vậy `x=1/30`

4) `x-2/7=1/35`

=>`x=1/35+2/7`

=>`x=11/35`

Vậy `x=11/35`

5) `x : -3/7=1/5`

=>`x=1/5*(-3/7)`

=>`x=-3/35`

Vậy `x=-3/35`

6)`1/4x-(-7/5)=-5/3`

=>`1/4x+7/5=-5/3`

=>`1/4x=(-5/3)-7/5`

=>`1/4x=-46/15`

=>`x=(-46/15 : 1/4)`

=>`x=-184/15`

Vậy `x=-184/15`

7) `x+5/12=3/8`

=>`x=3/8-5/12`

=>`x=-1/24`

Vậy `x=-1/24`

8)`-2/3-x=-5/4`

=>`x=-2/3-(-5/4)`

=>`x=-2/3+5/4`

=>`x=7/12`

Vậy `x=7/12`

9)`3/7-1/2x=5/3`

=>`1/2x=3/7-5/3`

=>`1/2x=-26/21`

=>`x=-26/21 : 1/2`

=>`x=-52/21`

Vậy `x=-52/21`