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- 9 + 6x = 15 + 2x
- 9x + 6x - 2x = 15
- 5x = 15
5x = 15
x = 15/5
x = 3
6x - 2x = 15 + 9
8x = 24
x = 24/8
x = 3
Solución :
x = 3