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X in (-oo:+oo)
X/12 = 7/17 // - 7/17
X/12-(7/17) = 0
X/12-7/17 = 0
1/12*X-7/17 = 0 // + 7/17
1/12*X = 7/17 // : 1/12
X = 7/17/1/12
X = 84/17
X = 84/17
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