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c in (-oo:+oo)
3-((2/5)*c) = 1/5 // - 1/5
3-((2/5)*c)-(1/5) = 0
(-2/5)*c-1/5+3 = 0
14/5-2/5*c = 0 // - 14/5
-2/5*c = -14/5 // : -2/5
c = -14/5/(-2/5)
c = 7
c = 7
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