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b = -4/2 = -2
2a+b = 2.1 + (-2) = 0
(-1/2A , -1/2B)
x² + y² - 2x + 4y + 1 = 0
A = -2
B = 4
C = 1
(-1/2A , -1/2B) = (-1/2(-2) , -1/2(4))
= (1, -2)
2a + b = 2(1) - 2
= 2 - 2
= 0