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