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x in (-oo:+oo)
2*x-(1/7) = 6 // - 6
2*x-(1/7)-6 = 0
2*x-1/7-6 = 0
2*x-43/7 = 0 // + 43/7
2*x = 43/7 // : 2
x = 43/7/2
x = 43/14
x = 43/14
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