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x in (-oo:+oo)
x = 600000-(x/5) // - 600000-(x/5)
x+x/5-600000 = 0
6/5*x-600000 = 0 // + 600000
6/5*x = 600000 // : 6/5
x = 600000/6/5
x = 500000
x = 500000
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