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x in (-oo:+oo)
280*x = 73/100 // - 73/100
280*x-(73/100) = 0
280*x-73/100 = 0
280*x-73/100 = 0 // + 73/100
280*x = 73/100 // : 280
x = 73/100/280
x = 73/28000
x = 73/28000
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