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Take (x-y) as a
2a (2a-3)-3 (2a-3)
0 0 0
It could have been simplified further dude
Let x-y be s.
Therefore, the expression becomes
4s^{2} -12s+9
=(2s)^{2} - 2*2s*3+(3)^{2}
Substituting s as x-y (as mentioned above) we get:

1 5 1
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