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c in (-oo:+oo)
c/5.1 = 18.87 // - 18.87
c/5.1-18.87 = 0
0.19607843*c-18.87 = 0 // + 18.87
0.19607843*c = 18.87 // : 0.19607843
c = 18.87/0.19607843
c = 96.23700067
c = 96.23700067
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