Question

Quanto é -3x-1 - x=x-2
------ -- --
4. 5. 7

Answer 1

Boa tarde Vihh

(-3x - 1)/4 - x/5 = x -  2/7 
 
mmc(4,5,7) = 140

-35*(3x + 1) - 28x = 140x - 40

-105x - 35 - 28x = 140x - 40

-133x - 35 = 140x - 40

273x = 5 

x = 5/273 

Answer 2

- 3x - 1    -   x      =  x -  2
-----------     -----            ----- 
     4             5                7

35.(- 3x - 1) - 28x = 140x - 20.2
----------------------   -----------------
    140                           140

- 105x - 35 - 28x = 140x - 40
- 133x - 35 = 140x - 40
- 35 + 40 = 140x + 133x
5 =  273x
273x = 5
x = 5/273

Resp.: x = 5/273

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Obs.: 

MMC (4,5,7) = 140

4,5,7: 2
2,5,7: 2
1,5,7: 5
1,1,7: 7
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1,1,1  = 2.2.5.7 = 4.35 = 140