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x in (-oo:+oo)
9*x = 1/7 // - 1/7
9*x-(1/7) = 0
9*x-1/7 = 0
9*x-1/7 = 0 // + 1/7
9*x = 1/7 // : 9
x = 1/7/9
x = 1/63
x = 1/63
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