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x in (-oo:+oo)
(x+197)/4 = 280 // - 280
(x+197)/4-280 = 0
(x+197)/4+(-280*4)/4 = 0
x-280*4+197 = 0
x-923 = 0
(x-923)/4 = 0
(x-923)/4 = 0 // * 4
x-923 = 0
x-923 = 0 // + 923
x = 923
x = 923
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