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C in (-oo:+oo)
(C-4)/5 = 7 // - 7
(C-4)/5-7 = 0
(C-4)/5+(-7*5)/5 = 0
C-7*5-4 = 0
C-39 = 0
(C-39)/5 = 0
(C-39)/5 = 0 // * 5
C-39 = 0
C-39 = 0 // + 39
C = 39
C = 39
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