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(6x+4)/3 = 4x/7 multiplicando en aspa
42x + 28 = 12x + 21
42x-12x = 21 - 28
12x = -7
x = -7/12
b)
1 -3
-------- = --------
5x-7 2x-8 multiplicando en aspa
2x-8 = 15x-21
-8 + 21 = 15x -2x
13 = 13x
1 = x
c)
x-5 4
-------- = -----
x+6 3 multiplicando en aspa
3x - 15 = 4x + 24
-15 - 24 = 4x - 3x
- 39 = x
D)
6 x-7
--- = -------
5 2(x-1)
12(x-1) = 5x - 35
12x - 12 = 5x - 35
12x - 5x = -35 + 12
7x = -23
X = - 23/7