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x in (-oo:+oo)
J = h-(x/n) // - h-(x/n)
J-h+x/n = 0
J-h+n^-1*x = 0 // - J-h
n^-1*x = -(J-h) // : n^-1
x = (-(J-h))/(n^-1)
x = (h-J)/(n^-1)
x = (h-J)/(n^-1)
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