x=-b/2a

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Solution for x=-b/2a equation: 


x in (-oo:+oo)

x = a*(-b/2) // - a*(-b/2)

x-(a*(-b/2)) = 0

(1/2)*a*b+x = 0

1/2*a*b+x = 0 // - 1/2*a*b

x = -(1/2*a*b)

x = -1/2*a*b

x = -1/2*a*b

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