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C in (-oo:+oo)
C/4 > 5 // - 5
C/4-5 > 0
1/4*C-5 > 0 // + 5
1/4*C > 5 // : 1/4
C > 5/1/4
C > 20
C in (20:+oo)
(20:+oo)
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