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X in (-oo:+oo)
(X+72)/7 = 12 // - 12
(X+72)/7-12 = 0
(X+72)/7+(-12*7)/7 = 0
X-12*7+72 = 0
X-12 = 0
(X-12)/7 = 0
(X-12)/7 = 0 // * 7
X-12 = 0
X-12 = 0 // + 12
X = 12
X = 12
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