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c in (-oo:+oo)
67-((3/4)*c) = 85 // - 85
67-((3/4)*c)-85 = 0
(-3/4)*c-85+67 = 0
-3/4*c-18 = 0 // + 18
-3/4*c = 18 // : -3/4
c = 18/(-3/4)
c = -24
c = -24
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