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c in (-oo:+oo)
(1000-(4*45))/7 = c // - c
(1000-(4*45))/7-c = 0
(1000-180)/7-c = 0
820/7-c = 0 // - 820/7
-c = -820/7 // * -1
c = 820/7
c = 820/7
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