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x in (-oo:+oo)
(7.9-2.7)/2.7 = x // - x
(7.9-2.7)/2.7-x = 0
1.92592593-x = 0 // - 1.92592593
-x = -1.92592593 // * -1
x = 1.92592593
x = 1.92592593
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