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c in (-oo:+oo)
(5.7*c)/2.3-4.2 = 33.819 // - 33.819
(5.7*c)/2.3-33.819-4.2 = 0
2.47826087*c-38.019 = 0 // + 38.019
2.47826087*c = 38.019 // : 2.47826087
c = 38.019/2.47826087
c = 15.341
c = 15.341
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