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