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x in (-oo:+oo)
(x+400)/2 = 490 // - 490
(x+400)/2-490 = 0
(x+400)/2+(-490*2)/2 = 0
x-490*2+400 = 0
x-580 = 0
(x-580)/2 = 0
(x-580)/2 = 0 // * 2
x-580 = 0
x-580 = 0 // + 580
x = 580
x = 580
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