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x in (-oo:+oo)
x = (320*((0.000276339*10)/280))/11 // - (320*((0.000276339*10)/280))/11
x-((320*((0.000276339*10)/280))/11) = 0
x-0.00028711 = 0
x-0.00028711 = 0 // + 0.00028711
x = 0.00028711
x = 0.00028711
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