ln(x/400)

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Solution for ln(x/400) equation: 


D( x )

x/400 <= 0

x/400 <= 0

x/400 <= 0

1/400*x+0 <= 0 // - 0

1/400*x <= 0 // : 1/400

x <= 0/1/400

x <= 0

x in (0:+oo)

ln(x/400) = 0

ln(x/400) = ln(e^0)

x/400 = e^0

x/400-e^0 = 0

1/400*x-1 = 0 // + 1

1/400*x = 1 // : 1/400

x = 1/1/400

x = 400

x = 400

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