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x = 126 : 3
x = 42
B) - 12 = 3x
- 12 - 3 = x
-15 = x
C) 6 = x/3
6 * 3 = x
18 = x
D) 35 = 7x - 2x
35 - 7 + 2 = 2x
30 = 2x
30 : 2 = x
15 = x
E) 7x + 2x = 27
9x = 27
x = 27 : 9
x = 3
F) x/3 = 5/3
x = 5/3 * 3 acá simplificamos los 3
x = 5