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X in (-oo:+oo)
12*X-7 = 14/2 // - 14/2
12*X-(14/2)-7 = 0
12*X-7-7 = 0
12*X-14 = 0 // + 14
12*X = 14 // : 12
X = 14/12
X = 7/6
X = 7/6
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