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c in (-oo:+oo)
(3*c)/4-1 > 1 // - 1
(3*c)/4-1-1 > 0
3/4*c-2 > 0 // + 2
3/4*c > 2 // : 3/4
c > 2/3/4
c > 8/3
c in (8/3:+oo)
(8/3:+oo)
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