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c in (-oo:+oo)
(-1/9)*c+13 = 5 // - 5
(-1/9)*c-5+13 = 0
8-1/9*c = 0 // - 8
-1/9*c = -8 // : -1/9
c = -8/(-1/9)
c = 72
c = 72
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