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x in (-oo:+oo)
x-((0.2*x)/3)+0.2*x = 10000 // - 10000
x-((0.2*x)/3)+0.2*x-10000 = 0
x-0.06666667*x+0.2*x-10000 = 0
1.13333333*x-10000 = 0 // + 10000
1.13333333*x = 10000 // : 1.13333333
x = 10000/1.13333333
x = 8823.52943772
x = 8823.52943772
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