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x in (-oo:+oo)
x+(5*x)/100 = 270000 // - 270000
x+(5*x)/100-270000 = 0
21/20*x-270000 = 0 // + 270000
21/20*x = 270000 // : 21/20
x = 270000/21/20
x = 1800000/7
x = 1800000/7
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