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X in (-oo:+oo)
(X-11)/2 = 13 // - 13
(X-11)/2-13 = 0
(X-11)/2+(-13*2)/2 = 0
X-13*2-11 = 0
X-37 = 0
(X-37)/2 = 0
(X-37)/2 = 0 // * 2
X-37 = 0
X-37 = 0 // + 37
X = 37
X = 37
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