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c in (-oo:+oo)
-15 = c/9-10 // - c/9-10
10-(c/9)-15 = 0
-1/9*c-5 = 0 // + 5
-1/9*c = 5 // : -1/9
c = 5/(-1/9)
c = -45
c = -45
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