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AX + BY + C = 0
4y - 7x + 5 = 12y + 2x + 8
- 7x - 2x + 4y - 12y = 8 - 5
- 9x - 8y = 3
- 9x - 8y - 3 = 0
Solución :
- 9x - 8y - 3 = 0