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c in (-oo:+oo)
6.6 = c/6 // - c/6
6.6-(c/6) = 0
6.6-1/6*c = 0 // - 6.6
-1/6*c = -6.6 // : -1/6
c = -6.6/(-1/6)
c = 39.59999921
c = 39.59999921
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