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x in (-oo:+oo)
x = (100-82.4)/82.4 // - (100-82.4)/82.4
x-((100-82.4)/82.4) = 0
x-0.01213592*(100-82.4) = 0
x-0.213592192 = 0 // + 0.213592192
x = 0.213592192
x = 0.213592192
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