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c in (-oo:+oo)
3/4 < 1/2-((3/2)*c) // - 1/2-((3/2)*c)
(3/2)*c+3/4-(1/2) < 0
(3/2)*c+3/4-1/2 < 0
3/2*c+1/4 < 0 // - 1/4
3/2*c < -1/4 // : 3/2
c < -1/4/3/2
c < -1/6
c in (-oo:-1/6)
(-oo:-1/6)
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