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x in (-oo:+oo)
x = (1/4)*ln(20) // - (1/4)*ln(20)
x-((1/4)*ln(20)) = 0
x+(-1/4)*ln(20) = 0
x-1/4*ln(20) = 0 // + -1/4*ln(20)
x = -(-1/4*ln(20))
x = 1/4*ln(20)
x = 1/4*ln(20)
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