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X in (-oo:+oo)
X/12 = 4/7 // - 4/7
X/12-(4/7) = 0
X/12-4/7 = 0
1/12*X-4/7 = 0 // + 4/7
1/12*X = 4/7 // : 1/12
X = 4/7/1/12
X = 48/7
X = 48/7
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