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32*(-1/2)*x^2+20*x+3 = 0
20*x-16*x^2+3 = 0
DELTA = 20^2-(-16*3*4)
DELTA = 592
DELTA > 0
x = (592^(1/2)-20)/(-16*2) or x = (-592^(1/2)-20)/(-16*2)
x = (4*37^(1/2)-20)/(-32) or x = (-4*37^(1/2)-20)/(-32)
x in { (4*37^(1/2)-20)/(-32), (-4*37^(1/2)-20)/(-32) }
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