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c in (-oo:+oo)
68 = (9/5)*c // - (9/5)*c
68-((9/5)*c) = 0
(-9/5)*c+68 = 0
68-9/5*c = 0 // - 68
-9/5*c = -68 // : -9/5
c = -68/(-9/5)
c = 340/9
c = 340/9
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