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X in (-oo:+oo)
(X+74)/10 = 58.9 // - 58.9
(X+74)/10-58.9 = 0
(X+74)/10+(-58.9*10)/10 = 0
X-58.9*10+74 = 0
X-515 = 0
(X-515)/10 = 0
(X-515)/10 = 0 // * 10
X-515 = 0
X-515 = 0 // + 515
X = 515
X = 515
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