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c in (-oo:+oo)
(2/5)*c-((1/5)*c)+4 = 9 // - 9
(2/5)*c-((1/5)*c)-9+4 = 0
(2/5)*c+(-1/5)*c-9+4 = 0
1/5*c-5 = 0 // + 5
1/5*c = 5 // : 1/5
c = 5/1/5
c = 25
c = 25
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