12=7x-x^2/4

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Solution for 12=7x-x^2/4 equation: 


x in (-oo:+oo)

12 = 7*x-((x^2)/4) // - 7*x-((x^2)/4)

(x^2)/4-(7*x)+12 = 0

(x^2)/4-7*x+12 = 0

1/4*x^2-7*x+12 = 0

DELTA = (-7)^2-(1/4*4*12)

DELTA = 37

DELTA > 0

x = (37^(1/2)+7)/(1/4*2) or x = (7-37^(1/2))/(1/4*2)

x = 2*(37^(1/2)+7) or x = 2*(7-37^(1/2))

x in { 2*(7-37^(1/2)), 2*(37^(1/2)+7) }

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