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c in (-oo:+oo)
6.5 = c/6.28 // - c/6.28
6.5-(c/6.28) = 0
6.5-0.15923567*c = 0
6.5-0.15923567*c = 0 // - 6.5
-0.15923567*c = -6.5 // : -0.15923567
c = -6.5/(-0.15923567)
c = 40.81999969
c = 40.81999969
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