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c in (-oo:+oo)
7 = (5/6)*c-8 // - (5/6)*c-8
7-((5/6)*c)+8 = 0
(-5/6)*c+7+8 = 0
15-5/6*c = 0 // - 15
-5/6*c = -15 // : -5/6
c = -15/(-5/6)
c = 18
c = 18
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