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3x = 7x + 7 * 3
3x = 7x + 21
3x - 7x = 21
- 4x = 21
x = 21/-4
Solución :
x = - 21/4
3x = 7x + 7 * 3
3x = 7x + 21
3x - 7x = 21
- 4x = 21
x = 21/-4
Solución :
x = - 21/4