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c in (-oo:+oo)
11.5 = c/pi // - c/pi
11.5-(c/pi) = 0
11.5-pi^-1*c = 0 // - 11.5
-pi^-1*c = -11.5 // : -pi^-1
c = -11.5/(-pi^-1)
c = 11.5/(pi^-1)
c = 11.5/(pi^-1)
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