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c in (-oo:+oo)
(1/3)*(2*c+8) = (1/5)*(3*c-5) // - (1/5)*(3*c-5)
(1/3)*(2*c+8)-((1/5)*(3*c-5)) = 0
(1/3)*(2*c+8)+(-1/5)*(3*c-5) = 0
1/3*(2*c+8)-1/5*(3*c-5) = 0
1/3*(2*c+8)-1/5*(3*c-5) = 0
1/15*c+11/3 = 0
1/15*c+11/3 = 0
1/15*c+11/3 = 0 // - 11/3
1/15*c = -11/3 // : 1/15
c = -11/3/1/15
c = -55
c = -55
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