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x= 3/5 · 4
x=12/5
B) x-2/x+4 = 1/2
(x-2)·2 = (x+4)·1
2x -4 = x+4
2x= x+8
2x-x = 8
x=8
C)x/x-4= 21/9
(x-4)·21 = x·9
21x -84 = 9x
21x - 9x = 84
12x= 84
x=84/12
x=7
D) 5-x/x= 1/3
(5-x)·3 = x ·1
15 - 3x = 1x
-3x -1x=-15
-4x =-15
x= 15/4
Espero que te sirva! Saludos!