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x in (-oo:+oo)
K = (1/2)*a+4*b // - (1/2)*a+4*b
K-((1/2)*a)-(4*b) = 0
K+(-1/2)*a-4*b = 0
K-1/2*a-4*b = 0
x naleu017Cy do R
x in (-oo:+oo)
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