Solve :
12x + 15y + 18 = 0
18x - 7y + 86 = 0
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8x + 13y - 29 = 0
12x - 7y - 17 = 0
3(2x + y) = 7xy
3(x + 3y) = 11xy; x ≠ 0, y ≠ 0