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x in (-oo:+oo)
ln(5/2) = 6*x // - 6*x
ln(5/2)-(6*x) = 0
ln(5/2)-6*x = 0
ln(5/2)-6*x = 0 // - ln(5/2)
-6*x = -ln(5/2) // : -6
x = -ln(5/2)/(-6)
x = ln(5/2)/6
x = ln(5/2)/6
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