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c in (-oo:+oo)
(c+14)/9 = (c-16)/5 // - (c-16)/5
(c+14)/9-((c-16)/5) = 0
(c+14)/9+(-1*(c-16))/5 = 0
(5*(c+14))/(5*9)+(-1*9*(c-16))/(5*9) = 0
5*(c+14)-1*9*(c-16) = 0
214-4*c = 0
(214-4*c)/(5*9) = 0
(214-4*c)/(5*9) = 0 // * 5*9
214-4*c = 0
214-4*c = 0 // - 214
-4*c = -214 // : -4
c = -214/(-4)
c = 107/2
c = 107/2
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