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t in (-oo:+oo)
12.5 = t/pi // - t/pi
12.5-(t/pi) = 0
12.5-pi^-1*t = 0 // - 12.5
-pi^-1*t = -12.5 // : -pi^-1
t = -12.5/(-pi^-1)
t = 12.5/(pi^-1)
t = 12.5/(pi^-1)
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