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c in (-oo:+oo)
(3*c)/1.8 = 22.8 // - 22.8
(3*c)/1.8-22.8 = 0
1.66666667*c-22.8 = 0 // + 22.8
1.66666667*c = 22.8 // : 1.66666667
c = 22.8/1.66666667
c = 13.67999997
c = 13.67999997
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