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x in (-oo:+oo)
B-(4/c) = b/2 // - b/2
B-(b/2)-(4/c) = 0
B-(b/2)-4*c^-1 = 0
B-1/2*b-4*c^-1 = 0
x naleu017Cy do R
x in (-oo:+oo)
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