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`1)4/x=8/(x+1)`

`=>4(x+1)=8x`

`=>4x+4=8x`

`=>4x+4-8x=0`

`=>4x-8x=-4`

`=>-4x=-4`

`=>4x=4`

`=>x=1`

Vậy `x=1`

--------------------------

`2)6/(x-3)=7/(x-5)`

`=>6(x-5)=7(x-3)`

`=>6x-30=7x-21`

`=>6x-30-7x+21=0`

`=>(6x-7x)+(-30+21)=0`

`=>-x+(-9)=0`

`=>-x=9`

`=>x=-9`

Vậy `x=-9`

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

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

`=>20-5x=3x-6`

`=>20-5x-3x+6=0`

`=>(20+6)+(-5x-3x)=0`

`=>26+(-8x)=0`

`=>(-8x)=-26`

`=>8x=26`

`=>x=26:8`

`=>x=3,25`

Vậy `x=3,25`

--------------------

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

`=>7(x-1)=6(x-5)`

`=>7x-7=6x-30`

`=>7x-7-6x+30=0`

`=>(7x-6x)+(-7+30)=0`

`=>x+23=0`

`=>x=-23`

Vậy `x=-23`

`#Oc`