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c in (-oo:+oo)
(2/5)*c-((1/5)*c)+4 = 0
(2/5)*c+(-1/5)*c+4 = 0
1/5*c+4 = 0 // - 4
1/5*c = -4 // : 1/5
c = -4/1/5
c = -20
c = -20
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