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c in (-oo:+oo)
c/3 > -1.5 // + 1.5
c/3+1.5 > 0
1/3*c+1.5 > 0 // - 1.5
1/3*c > -1.5 // : 1/3
c > -1.5/1/3
c > -4.50000005
c in (-4.50000005:+oo)
(-4.50000005:+oo)
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