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y= 3x-3
------------------- -
0 = x^2 - 6x + 9
0 = (x - 3)^2
0 = x - 3
x = a =3
y = 3x - 3
y = 3 . 3 - 3
y = b = 6
2a + b = 2. 3 + 6
= 6 + 6
= 12