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a^2 -ab +6a -ba +b^2 -6b +6a -6b +36 - (a^2 -2ab + b^2) =
a^2 +b^2 -2ab +12a -18b +36 -a^2 +2ab - b^2 =
+12a -18b +36 =
12a -18b = -36
6(2a - 3b) = -36
2a - 3b = -6
Desde este punto no se si estare en lo correcto:
a - 3b = -6/2
a - 3b = -3
a - b = -3/-3
a - b = 1