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c in (-oo:+oo)
18*c^4-(c*((16*c^2)/(-2))) = 0
18*c^4+8*c^3 = 0
18*c^4+8*c^3 = 0
2*c^3*(9*c+4) = 0
9*c+4 = 0 // - 4
9*c = -4 // : 9
c = -4/9
2*c^3 = 0
2*c^3 = 0 // : 2
c^3 = 0
c = 0
c in { -4/9, 0 }
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