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C in (-oo:+oo)
(C+4)/3 = 7 // - 7
(C+4)/3-7 = 0
(C+4)/3+(-7*3)/3 = 0
C-7*3+4 = 0
C-17 = 0
(C-17)/3 = 0
(C-17)/3 = 0 // * 3
C-17 = 0
C-17 = 0 // + 17
C = 17
C = 17
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