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c in (-oo:+oo)
7-((5/6)*c)-8 = 0
(-5/6)*c-8+7 = 0
-5/6*c-1 = 0 // + 1
-5/6*c = 1 // : -5/6
c = 1/(-5/6)
c = -6/5
c = -6/5
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