Question

Equação:
X/4 + X/6 + X/8 = 26
.....................................

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

Answer 1

X/4 + X/6 + X/8 = 26                        MMC = 24
6x/24 + 4x/24 + 3x/24 = 624/24          agr corta o 24 em todos
6x + 4x + 3x = 624 
13x = 624 
x = 624/13
x = 48

3x+5/4 - 2x-3/3 = 3            MMC = 12
9x+15/12 - 8x -12/12 = 36/12
9x + 15 - 8x - 12 = 36
9x - 8 = 36 - 15 + 12
x = 33 

Answer 2

a)

 x   +   x   +  x    =   26
----    -----    -----
  4       6        8

6x + 4x + 3x             624
--------------------  =   ---------
       24                       24

13x = 624
x = 624/13
x = 48

Resp.: 48

************************************
mmc = 24

4,6,8: 2
2,3,4: 2
1,3,2: 2
1,3,1: 3
-------------------------
1,1,1  =  2.2.2.3 = 8.3 = 24

************************************
b)

3x + 5    -   2x - 3    =  3
----------     ----------
      4               3

3.(3x + 5) - 4(2x - 3) =  12.3
---------------------------    -------- 
           12                       12

9x + 15 - 8x + 12 = 36
9x - 8x + 15 + 12 = 36
x + 27 = 36
x = 36 - 27
x = 9

Resp.: 9

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mmc (4,3) = 12

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