Question

x-3 sobre 4 -x-1 sobre 6 =-2

Answer 1

x - 3  -   x - 1    =   - 2
-------   -------- 
  4            6

3.(x - 3) - 2(x - 1)      =  12.(-2)
-------------------------       ----------
       12                             12

3(x - 3) - 2.(x - 1) = 12.(- 2)
3x - 9 - 2x + 2 = - 24
3x - 2x - 9 + 2 = - 24
x - 7 = - 24
x = - 24 + 7
x = - 17

Resp.: x = - 17

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Obs.: 
mmc (4,6) = 12

4,6: 2
2,3: 2
1,3: 3
-------------
1,1  = 2.2.3 = 4.3 = 12

Answer 2

x-3$\frac{x-3}{4} - \frac{x-1}{6} = -2 = \frac{x-3}{4/12} - \frac{x-1}{6/12}= \frac{-2}{1/12}$
x=-24+9+2
x=13