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x in (-oo:+oo)
3/pi = 3*x // - 3*x
3/pi-(3*x) = 0
3/pi-3*x = 0
3/pi-3*x = 0 // - 3/pi
-3*x = -(3/pi) // : -3
x = (-(3/pi))/(-3)
x = pi^-1
x = pi^-1
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