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yx - 3y = xy -2x
yx - 3y - xy + 2x =0
2x - 3y = 0
xy - 6y = 54 + x( y+9)
xy - 6y = 54 + xy +9x
xy -6y - 54 - xy - 9x = 0
-6y - 9x - 54 = 0
-6y - 9x = 54
...................Kd
1) Ya conocemos el valor de Y
2)