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x in (-oo:+oo)
(2/5)*m-((1/2)*c) = k // - k
(2/5)*m-((1/2)*c)-k = 0
(-1/2)*c-k+(2/5)*m = 0
2/5*m-1/2*c-k = 0
x naleu017Cy do R
x in (-oo:+oo)
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