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c in (-oo:+oo)
(2/5)*(c-2) = -3 // + 3
(2/5)*(c-2)+3 = 0
2/5*(c-2)+3 = 0
2/5*(c-2)+3 = 0
2/5*c+11/5 = 0
2/5*c+11/5 = 0
2/5*c+11/5 = 0 // - 11/5
2/5*c = -11/5 // : 2/5
c = -11/5/2/5
c = -11/2
c = -11/2
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